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Author Topic: 8 position lathe toolchanger  (Read 7852 times)

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8 position lathe toolchanger
« on: June 01, 2011, 06:12:48 AM »
Hi all

I am in the early stage of converting  an Emcoturn 120
to Mach control and at the moment I am looking at the toolchanger
it appears to be a really well made bit of kit (see photos)

It is a pawl design with a spring loaded pin used for location
meaning it can only rotate in one direction ( although the manual I
have says it can move either direction but I cant see any method for
retracting pin so I think it may be for a later version unless someone
out there can put me right) The turret position is controlled by 4 sensors
and cutaway vane which produces 4 output signals shown in the table.
Movement is via a small dc motor controlled by an emco board.

It is my intention to change the dc motor with a stepper and have a fast
rotate followed by a slow reversed rotate to lock pin as I have seen a
macro on the forum to tackle this type of setup. I have also seen another
macro setup to handle pin position input. (with if possible including the
option of a manual selector or rotate switch)

I have some user experience of mach3 mill but none of mach3 turn
and this if my first venture into the nuts and bolts of system setup.

I would like to be able to either modify existing programs or write
new to suit but dont have any knowledge of vb script .Can anyone
out there tell where I can find list of commands and construction rules
or recommend a book. As this is a skill I would love to master.

Also I am  a bit lost at the moment on how to convert the sensor
output results (see table) so mach knows that for example
1011 is position 5

any help would be greatly appreciated

cheers George

Online Tweakie.CNC

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Re: 8 position lathe toolchanger
« Reply #1 on: June 01, 2011, 07:47:53 AM »
The Visual Basic version used is Cypress Enable and the commands and syntax in PDF format can be downloaded from here;

http://www.machsupport.com/forum/index.php?action=dlattach;topic=18062.0;attach=26020

Also Scott's Mach specific routines here;

http://www.machsupport.com/forum/index.php?action=dlattach;topic=11056.0;attach=14194

http://www.machsupport.com/forum/index.php?action=dlattach;topic=11061.0;attach=14193

Hope this helps,

Tweakie.
« Last Edit: June 01, 2011, 08:00:14 AM by Tweakie.CNC »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: 8 position lathe toolchanger
« Reply #2 on: June 01, 2011, 08:40:36 AM »
thanks Tweakie thats exactly what I was looking for.

now the learning curve begins

cheers george

Offline BR549

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Re: 8 position lathe toolchanger
« Reply #3 on: June 01, 2011, 10:36:43 AM »
Might want to consider using the TC as is. Obviously it worked well ???  Just need to work out the control.

Just a thought(;-) TP
Re: 8 position lathe toolchanger
« Reply #4 on: June 01, 2011, 11:31:01 AM »
Hi TP

Was looking to change to stepper motor as I don't think I have the electrical ability to work out dc motor drive control.

Stepper approach seems more achievable (for me)

However if anyone out the has already integrated an Emcoturn 120 turret I would love to hear from them.

I'm all in favour of saving some money

Cheers George

Offline BR549

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Re: 8 position lathe toolchanger
« Reply #5 on: June 01, 2011, 12:49:47 PM »
Check with TANTAN here:  http://www.machsupport.com/forum/index.php/topic,5718.10.html

Looks like he has converted one with Tool changer.

Just a thought(;-) TP
Re: 8 position lathe toolchanger
« Reply #6 on: January 25, 2017, 04:21:30 PM »
HI Bigwing

I also have a turn 120.  I would like to know how much voltage is used for the sensors and on what pins it uses.
Thanks
Penguinair ;)

Offline Graham Waterworth

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Re: 8 position lathe toolchanger
« Reply #7 on: January 26, 2017, 07:20:06 AM »
There is a M6Start.m1s on here somewhere to run that tool changer using the DC motor I know this because I did the code for it.

Without engineers the world stops
Re: 8 position lathe toolchanger
« Reply #8 on: January 26, 2017, 12:37:37 PM »
Hi Penguinair

I am not the best person to ask as my Electrical knowledge is very limited.

I read the diagram (may be wrong but see sensor outputs attachment above) as 24v supply but I was not able to

correctly decipher the pin outs and managed to smoke my board. !!**@@**!! The price for a replacement from

Emco was circa £300 GBP  So I managed to replicate the boards function using off the shelf parts for about £5 GBP

(see attachments) Basically it is just 4 photo interrupter sensors used to produce the output signals. The schmitt

trigger inverter conditions the output to be either 0 or 1 nothing in between. Note the attached diagram only shows

the circuit for one sensor obviously the complete circuit requires four. The outputs were sent via a pokeys  to a tool turret brain.

(see working solution @ machsupport forum/mach discussion/brains development /" compare immediate not working" BIGWING

www.machsupport.com/forum/index.php/topic,30316.0.html

This program followed the truth table to give a value for the current tool which I used in my modified M6Start.mls program

to index the turret.

However I am aware that there is a ready made control solution to the emco tool turret with a complete integrated package

in mach. I think the developers name is Andy Barrow. I think the company name is barrow dynamics but I might have my wires crossed there.

Best idea is to google it. I am sure if you get in touch with him he will know what the correct pin outs are for the Emco board

and save you a lot of work.

Cheers George
Re: 8 position lathe toolchanger
« Reply #9 on: January 26, 2017, 01:03:47 PM »
BIGWING
THANKS FOR THE HELP.
RICHARD