Sherline Products 8700 Leitfaden

SHERLINE CNC Rotary Table

P/N 8700

Dimensions

Table diameter: 4.0" (102mm)

Table height: 2.0" (51mm)

CLICK HERE to view a dimensioned drawing of the rotary table with stepper motor mounted, or see the General Description

page on the CNC rotary table for performance specifications.

INSTALLING AND USING

THE SHERLINE CNC ROTARY TABLE AND CONTROLLER

By Bryan Mumford and Joe Martin

INTRODUCTION

Bryan Mumford and I are very proud of this product. It has taken Sherline twice the investment in both time and money

compared to what we originally planned for this project. This project would have been a lot easier if we built the $4000 product

that we are competing with. We have taken a very expensive product that has only been available to very successful professional

businesses and produced a self-contained unit that not only has the features of the expensive units, it is also simpler to use and

very affordable. In fact, it is so inexpensive, home hobbyists can now afford to own and use this equipment. It should also be

noted that we didn't copy anyone to accomplish this feat. My only disappointment was that I was unable to find a way to adapt

our existing rotary tables to a CNC unit. It just couldn't be done in a cost-effective manner because of the mechanical parts that

couldn't be interchanged due to the way the rotary table is manufactured.

Even though the computer is small, it is a very complex device that both computes and drives the stepper motor in microsteps.

Like all electronic devices, the easier it is to operate, the harder it is to design and program. We believe the instructions are easy

to read and shouldn't give you any problems, but if they do, please notify us at Sherline, and we will attempt to improve them. We

want our instructions to be the best in the business. The most important rule is to always work safely and accurately.

POWER OF THE MOTOR

The stepper motor is rated at over 100 oz-in of torque, with the highest power being achieved at low RPM. The maximum speed

of 50°/sec provides high speed but very little power. To use that setting for positioning, the system must be completely free from

drag. We recommend using a maximum speed of 40°/sec as a positioning speed to avoid stalling the stepper motor. When

cutting, slow speed should be used to take advantage of the motor's power.

POSITIONING ACCURACY

The first thing to understand about the rotary table is the accuracy that can be obtained in real terms. The stepper motor takes

400 steps to make exactly one revolution. This motor drives the worm, which needs to make 72 revolutions to make the rotary

table turn exactly one revolution. This means that it takes 28,800 steps (400 x 72) to drive the rotary table one complete

revolution. Take this number and divide by the number of degrees in a circle (360°) and we end up with 80 steps for each degree

or 0.0125° (or 0.75 minutes) for each step. The built-in computer will calculate to the closest position. This means the final

position will be within ± 1/2 step. This turns out to be a very small amount, because the sine of this angle is only 0.0001091. This

will amount to 0.109" (2.77mm) rise in 1000" (83'- 4" or 25.4 m) when compared to a flat plane. This is just .00022" (.0055mm)

at the edge of the table.

MECHANICAL ACCURACY

The gear that turns electronic signals into a real movement has been hobbed directly into the table, which means the teeth have

been generated on a machine that cuts the teeth with a cutter similar to a worm as the part is turning. This eliminates any error

associated with cutting each tooth individually. As anyone associated with the machine trades realizes, "nothing is perfect". This is

also the case for this product; however, I seriously doubt if anyone buying it could measure the mechanical indexing error of the

worm and gear. The electronic system has no error in its calculations, but it does round off as previously explained.

THE IMPORTANCE OF READING THE INSTRUCTIONS

It is impossible to make a product this complex "idiot proof". The best rule I've ever come up with when dealing with any type of

CNC equipment is this: "You have to know what the unit will do after you push the button BEFORE you push the button." This

can only be accomplished by reading the instructions and "playing with the rotary table" at the same time until you thoroughly

understand how the features of this unit work. It isn't necessary to understand the interfacing options to safely operate the CNC

rotary table. Don't mount this unit on a mill that has a cutter in the spindle until you truly understand how to control it.

PRECAUTIONS WHEN TURNING ON THE UNIT

• As with any piece of electronic equipment, make sure the power is off before plugging the stepper motor connecting cord into

the control unit.

• If a part has been aligned on the table and the power is switched off; the part should be realigned after turning the unit back on

before continuing. Electrical "spikes" can cause the motor to move a few steps when turning it on. The power can be left on

continuously without damage; however, the controller should be left in "Jog" mode to prevent the motor from being energized. If

you don't do this, the motor may be left energized because the motor is electrically locked in position after a controlled move.

Always record your handwheel settings at a "home" for future use.

OPERATING INSTRUCTIONS

The Sherline Rotary Table Controller is a self-contained microprocessor-based controller that will automate the motion of the

Sherline rotary table. Though you can still crank the table by hand when in the jog mode or when the controller is turned off, the

controller is designed to crank it for you in precise, measured steps.

PRECAUTIONS REGARDING MANUAL MODE

When hand cranking the handwheel in the manual mode, the stepper motor acts as a generator. If you crank the handwheel

rapidly, there is a chance that the control box electronics could be damaged by the current generated. If the unit is to be used

extensively in the manual mode, it is recommended that you disconnect the cable from the motor to the controller.

START-UP COMMANDS

Note: You can skip over the START-UP and SETTINGS COMMANDS if you are reading this for the first time. The

factory default settings will work and these settings are only needed for advanced operations.

There are several utility commands that can be issued by holding down certain keys when the controller is first turned on. For

example, to enter the SLAVE MODE (to run the controller with STEP and DIRECTION signals from another CNC controller)

hold down the [ 1 ] key when you first turn the controller on.

The four start-up commands are:

[ 1 ] - Enter "Slave" mode.

[ 7 ] - Show the revision date of the firmware.

[ 9 ] - Erase all program memory locations.

[MODE] - Erase all program memory locations and initialize all settings to factory defaults.

These commands are described in detail in the appropriate section if needed.

FIGURE 1-The keypad layout

THE "SETTINGS" MODE

The next mode after the Program Mode is the Settings Mode. This allows you to enter some parameters of operation for the

table. These settings are remembered even when you turn the controller off.

SLOW SETTING

When the screen displays:

Settings Mode

Press Enter

Press the [ENTER] key. The screen will then display something similar to:

Slow: 15

Enter a number*

The number after the word SLOW is the minimum feed rate of the rotary table. This is the speed with which the table starts each

movement. The units are degrees per second. Whenever the table moves, it starts at the SLOW feed rate and ramps up to the

FAST feed rate. It also ramps down to the SLOW rate before stopping.

When the screen shows the value you wish to use for SLOW, press the [ENTER] key. The value will be stored and

remembered for all future operations and used with the JOG, DEGREES and DIVISION modes.

*NOTE: When entering more than 72 divisions or less than 5°, use a speed setting of 10 or 15. Faster settings can cause

the motor to overshoot the intended stopping point. (Settings less than 1° require a setting of 10.)

FAST SETTING

The screen will then display something similar to:

Fast: 40

Enter a number

The number after the word FAST is the maximum feed rate of the table. This is the maximum speed the table reaches in each

movement. The units are degrees per second. Whenever the table moves, it starts at the SLOW feed rate and ramps up to the

FAST setting. If you set the FAST rate the same as the SLOW rate, the rate of motion will be constant during the move. The

table does not have much power at the fastest settings, so very fast settings should only be used for positioning, not for cutting

operations. Experience will teach you what speeds are appropriate for your own work. (The maximum speed that can be entered

is 50 degrees/sec.)

When the screen shows the value you wish to use for FAST, press the [ENTER] key. The value will be stored and remembered

for all future operations and used with the JOG, DEGREES and DIVISION modes.

DIRECTION SETTING

The screen will then display something similar to:

Direction: 3

Press 1 or 3

This parameter allows you to enter the default direction of travel. Whenever these instructions display "clockwise" or

"counterclockwise", they assume the default direction is set to be clockwise. If you need the table's motion to be

counterclockwise, this can be arranged. If you type [ 3 ] the default direction will be set to clockwise. If you type the number [ 1 ]

key (marked with a left arrow) the default direction will now be set as counterclockwise.

SETTING THE ELECTRONIC BACKLASH COMPENSATION

The physical backlash in the worm gear can be minimized with proper adjustment (See "Maintenance" section later in these

instructions); however, it cannot be totally eliminated. The controller supports electronic backlash correction to compensate for

whatever actual backlash remains in the worm gear. It works in this way: Every time the table makes a motion in the "reverse"

direction, it will overshoot the amount of travel by the backlash amount, and then move "forward" by the same amount. This takes

up any backlash in the worm gear. You can set the backlash correction to any amount you like. If you set it to zero, it will not be

used. If you set it to a small amount, it can just exactly take up the backlash in your rotary table. If you set it to a relatively large

value, you can see the table overshoot and then return to correct position.

The LCD screen will display something similar to:

Backlash: 010

Enter a number

The number represents the number of motor steps to overshoot by.* When you have typed the backlash setting you want, press

the [ENTER] key to store it. The controller will then go back to the Division Mode.

*NOTE: 8 steps = 1 division line on the handwheel = 0.1° .

You can determine the amount of backlash compensation to use by trial and error and your own preference. To evaluate the

current backlash setting, go to the DIVISION mode. Enter something like 50 divisions. Hit the [PRV] key. The table will move in

the reverse direction and overshoot the distance specified by the backlash amount, then change direction and move forward by

the backlash amount. If the backlash setting is small, you won't notice it. If it is large, it will be easy to see.

THE "JOG" MODE

The Jog Mode allows you to quickly move the table in clockwise and counterclockwise directions with the keypad. To enter the

Jog Mode, press the [STOP] (Jog) key.

In Jog Mode the motor is not powered. This means you can turn the crank by hand for fine positioning. You can also hold down

the [ 1 ] or [ 3 ] keys for rapid, motorized motion. The feed "rapid" feed rate is controlled by the "fast setting" entered in the

Settings mode. "1" will move the table counterclockwise, "3" will move it clockwise. The [ 7 ] and [ 9 ] keys will move the table in

a similar manner only in this case the feed rate will be controlled by the "slow setting." For setting up you can also take very fine,

slow movements. [NXT] will move the table clockwise, [PRV] will move it counterclockwise.

When you are finished with the Jog Mode, press the [MODE] key to go back to the Division Mode.

NOTE: In addition to using it in the Jog Mode, you can also press the [STOP] (Jog) key at any time the table is moving, and it

will serve as a PANIC STOP, immediately stopping the table in place. In any mode other than the Jog Mode, if the table is in

motion and you want to stop it immediately, simply press the [STOP] (Jog) key. Doing so leaves the table in the JOG mode, and

it will need to be reset to your previous mode before continuing.

MOVING THE TABLE

There are four primary ways to move the table electronically:

1. DIVISION MODE - you can enter a number of equal divisions in which to divide one rotation of the table. For example,

if you enter "4", the table will move in 90 degree increments (360 / 4 = 90). A typical application of this mode would be

gear cutting and hole patterns.

2. DEGREES MODE - you can specify the exact number of degrees to move the table. For example, if you enter

"132.130", the table will move 132.130 degrees.

3. JOG MODE - you can move the table clockwise or counterclockwise with the keypad on the controller.

4. PROGRAMMED - you can program of movements. For example, you can have the table move 90°, then 132°, then

reverse rotation 20°, etc. You can enter up to 40 blocks in each of two separate programs. A block of information

contains the speed of rotation (feed rate) for each block, and whether the table is to pause and wait after a block is taken

or move continuously.

GENERAL SPECIFICATIONS

• The resolution of positioning is ± .006 degrees.

• The speed of rotation can be set from one degree per second to 50° per second. Note that the higher speeds do not have much

power and should only be used for positioning the table quickly, not for cutting operations.

• The controller uses "ramping" to accelerate and decelerate during each movement. You can enter the minimum and maximum

speeds used to suit your work. (The amount of ramping becomes more noticeable when the slow feed is set below 5 in the

Settings mode.)

• The controller allows a programmable amount of backlash compensation.

USING THE CONTROLLER

The controller must be plugged into its AC adapter power supply. The power jack is located on the end of the unit. It is turned on

with the toggle switch located next to the power jack. We wish that the power supply connector had a better locking system, but

we had to use what was commercially available. With the power turned off, the motor cable must be plugged into the 5-pin DIN

connector next to the power switch.

The basic operation of the controller is to press the [MODE] key to advance from one mode of operation to the next. This will

cycle through the various modes of operation. When the mode you wish to use is displayed, press the [ENTER] key to start that

mode and enter the parameters of operation. The four modes are:

• Division

• Degrees

• Program

• Settings

THE "DIVISION" MODE

The Division Mode allows you to specify a fixed number of divisions per rotation of the rotary table. For example, you might

specify "four" divisions. Then, each time you tell the table to advance, it will rotate one fourth of 360 degrees, or 90 degrees.

When you first turn on the controller, it will display "Sherline Rotary Table". Press the [MODE] key once to advance to the

first mode. The LCD (liquid crystal display) screen will display:

Division Mode

Press Enter

To use the Division Mode, press the [ENTER] key. The LCD screen will then display:

Divisions: 000

Enter a number

You should now enter the number of divisions in which you wish to divide the rotation. When you press a number key, that

number will appear on the LCD screen where the cursor is blinking. To move the cursor left, press the [PRV] (Previous) key. To

move the cursor right, press the [NXT] (Next) key or type any digit. You can enter any value between zero and 999 divisions.

(Zero is a special case. It will cause the table to run continuously until you stop it. See the section on page 8 regarding continuous

motion for an explanation of this action.)

When the number of divisions you want is displayed, press [ENTER]. For example, suppose you typed "030" for the number of

divisions. After you hit the [ENTER] key, the LCD screen will display:

Division # 1

Press Nxt or Prv

This means that the table is at position one (of 30), and it is waiting for you to press the [NXT] or [PRV] keys. If you press

[NXT], the table will advance 12 degrees clockwise, and the LCD screen will display:

Division # 2

Press Nxt or Prv

If you had pressed the [PRV] key, the table would move 12 degrees counterclockwise, and the LCD screen would display:

Division # 30

Press Nxt or Prv

It displays "Division # 30" because it turned counterclockwise one position, from one to 30.

There is a special function available in the Division Mode. After you have set the controller up to move with the [NXT] and

[PRV] keys, you can press the [MINUS] key. This will cause the table to move one division with a one-second delay between

movements. It will continue making the programmed movement with one-second delay between movements until you stop it with

the [STOP] (JOG) key. (If the [STOP] key is hit between movements while the table is not moving, it must be held down longer

than one second to stop the movement.)

PANIC STOP-Any time the table is moving you can stop it immediately by hitting the [STOP] (Jog) key. This will stop all

motion and put you into the JOG mode. You to lose your place in the program you were running and will have to start over. Hold

the key down until you're sure the program has shut. A momentary "blip" will not shut the program down unless the table is

moving.

To exit the Division Mode, press the [MODE] key.

THE "DEGREES" MODE

The Degrees Mode allows you to specify the exact number of degrees the table will rotate every time you tell it to advance. Keep

in mind that the resolution of the table is .0125 degrees. This means, for example, that it cannot move to a position like "0.010"

degrees which is not an even multiple of "0.0125". However, the table keeps track of exactly where it's supposed to be and

where it is actually able to go, and always gets as close to the correct location as is possible (within .006 degrees).

When the LCD screen displays "Division Mode" you can press the [MODE] key once to advance to the Degrees Mode. The

LCD screen will display:

Degrees Mode

Press Enter

To use the Degrees Mode, press the [ENTER] key. The LCD screen will then display:

Degrees: 000.000

Enter a number

You can now enter the number of degrees you wish to travel at each movement. When you press a number key, that number will

appear on the LCD screen where the cursor is blinking. To move the cursor left, press the [PRV] (Previous) key. To move the

cursor right, press the [NXT] (Next) key or type any digit.

You can also specify whether the table is to move clockwise or counterclockwise when you enter the number of degrees to

move. To enter a counterclockwise value, press the [MINUS] key. This will add a minus sign before the degree amount,

indicating reverse travel. If the degree size is negative, the [NXT] key will move the table counterclockwise and [PRV] will move

clockwise. To make a negative value positive again, press the [MINUS] key again.

(Note that it is also possible to change the default direction of travel from clockwise to counterclockwise. See the Settings mode

for details.)

You can also tell the controller to move zero degrees. This is a special case. It will cause the table to run continuously until you

stop it with the [STOP] key. See the section below labeled "Continuous Motion" for an explanation of this action.

When the number you want is displayed, press [ENTER]. For example, suppose you typed "020.000" for the number of

degrees. After you hit [ENTER], the LCD screen will display:

020.000 000.000

Press Nxt or Prv

The first number is the movement size you selected (20.000 degrees). The second number is the current position (000.000

degrees). The controller is waiting for you to press the [NXT] or [PRV] keys. If you press [NXT], the table will advance 20

degrees clockwise, and the LCD screen will display:

020.000 020.000

Press Nxt or Prv

The current position is now shown to be 20 degrees. If you press [NXT] again, the screen will show:

020.000 040.000

Press Nxt or Prv

The current position is now shown to be 040.000 degrees.

If you had pressed the [PRV] key the first time, the table would move 20 degrees counterclockwise, and the LCD screen would

display:

020.000 340.000

Press Nxt or Prv

The current movement is shown to be 20.000 degrees and the current position is 340 degrees (360 degrees minus 20 degrees).

PANIC STOP-Any time the table is moving you can stop it immediately by hitting the [STOP] (Jog) key. This will stop all

motion and put you into the JOG mode. You to lose your place in the program you were running and will have to start over.

To exit from the Degrees Mode, press the [MODE] key.

THE "PROGRAM" MODE

The Program Mode allows you to prepare a list of many movements to take one after another. For each block you will enter four

parameters:

1) The number of degrees to move,

2) The direction of travel (clockwise or counterclockwise),

3) The feed rate for that move, and

4) Whether or not the table should wait for you to hit the [NXT] key after each block of information is completed.

The program you enter will be remembered indefinitely (unless you change it), even if you turn the controller off. There is room for

two separate programs of 40 blocks each.

Before you enter your program blocks, you'll want to plan them carefully to be sure they're correct before typing them all in.

Write them down on paper and check for errors. (A form that you can copy is provided as the last page of these instructions.)

The Program Mode comes after the Degrees Mode. Press the [MODE] key until the screen displays:

Program Mode

Press Enter

Then press the [ENTER] key. The screen will display:

Which program?

Press 1 or 2...

You can now select which program you will use. Type the digit "one" or "two" and the screen will display something similar to:

Program 1

Run=NXT Edit=PRV

This indicates which program you've selected, and that you should press the [NXT] key to run the program that was stored

previously, or press the [PRV] key to enter a new program.

ENTERING A NEW PROGRAM

If you press the [PRV] key, the LCD screen will show you the degree setting for the first program block and allow you to change

it. For example, the screen might show something similar to this:

Block 1:1

Degrees: 090.000

The "1:1" means you're working on program one, block number one. The first movement in this example will move the table 90

degrees clockwise. To change this amount, type the number keys. You can press [NXT] to move the cursor to the right or

[PRV] to move the cursor to the left.

You can indicate whether you want the table to move clockwise or counterclockwise. To enter a counter- clockwise direction,

press the [MINUS] key. This will place a minus sign before the degree amount, indicating reverse travel. If you press the

[MINUS] key again, the minus sign will be removed and the direction will be clockwise.

(Note that it is also possible to change the default direction of travel from clockwise to counterclockwise. See the Settings mode

for details.)

When the screen shows the movement you wish, press the [ENTER] key to enter (and store) your selection.

The screen will then display something similar to this:

Block 1:1

Feed rate: 15

This means that the feed rate for this programmed block is 15 degrees per second. The number you enter will be the fastest rate

the table will reach during a move. The SLOW rate (the rate it starts at each time) depends on what you entered for SLOW in the

Settings Mode. You can change the feed rate to anything between 1 and 50 degrees per second.

When the screen shows the feed rate you wish to use, press [ENTER] again. The LCD screen will then display something similar

to:

Block 1:1

Pause

You can tell the controller to pause after each block or continue to the next block. If you tell it to pause, you must hit the [NXT]

key during program execution before it will advance. To set the current program block to pause, press the [ 7 ] key (marked

"slow"). To set the current program block to NOT pause, press the [ 9 ] key (marked "fast").

After setting the PAUSE parameter how you want it, hit the [ENTER] key. The LCD screen will then display something similar

to:

Block 1:2

Degrees: 000.000

This indicates that you're ready to program the movement for block number 2 in the first program. You can now define the block

size, feed rate, and pause status just like you did for the first block.

When you've entered all of the program blocks you wish, terminate the program by entering a movement of "000.000" and a

pause or no pause. This tells the controller to stop asking for new input and prepares to run the program you've just entered.

INSERT AND DELETE

When entering a program you may make a mistake, or you may wish to modify a program after it has been entered. You can

INSERT and DELETE program blocks to correct or modify an existing program. To access the INSERT and DELETE

functions, press the [MODE] key while the controller is waiting for you to enter the number of degrees for any program

movement. (You can't use INSERT or DELETE after entering the degree size.) The LCD screen will then display something

similar to:

Block 1:5

Insert?

You can now insert a new movement at this point in the program by hitting the [ENTER] key. The LCD screen will display

something similar to:

Block 1:5

Wait...

After a few seconds the word "Wait..." will go away and you will be able to enter a movement for the new, inserted position.

If you do not INSERT a program block but rather press the [MODE] key a second time, the controller will display:

Block 1:5

Inhaltsverzeichnis

Beliebte Steuerungssystem Handbücher anderer Marken

Pentair Pool Products

Pentair Pool Products Compool Bedienungsanleitung

ComfortNET

ComfortNET CTK04 Bedienungsanleitung

Fireye

Fireye InSight II 95DSS3 Bedienungsanleitung

CAME

CAME G3000 Bedienungsanleitung

Idemia

Idemia MorphoAccess VP MD Bedienungsanleitung

Axis

Axis P1445-LE-3 Bedienungsanleitung

HEIDENHAIN

HEIDENHAIN TNC 150 B Bedienungsanleitung

CNC-Step

CNC-Step High-Z T-Series Bedienungsanleitung

Doosan

Doosan DVF Series Bedienungsanleitung

Honeywell

Honeywell KAP 140 Bedienungsanleitung

Honeywell

Honeywell vk41 series Bedienungsanleitung

AirBench

AirBench FPW Installationsanleitung

Cypress

Cypress HHR-3160 Bedienungsanleitung

CAME

CAME GLT40AOS Bedienungsanleitung

Zonex

Zonex GEN II -VVT Benutzerhandbuch

Altronics

Altronics K 9650 Bedienungsanleitung

micro-trak

micro-trak RoadMaster Bedienungsanleitung

micro-trak

micro-trak Calc-An-Acre II Bedienungsanleitung