What do I need to add to turn threads
29 Mar 2017 20:02 #90520
by MAG45
What do I need to add to turn threads was created by MAG45
I am about to rebuild my shopmaster eldorado which was converted to CNC several years ago, but has had issues the last couple years. I havent been able to figure out the issues and decided it will be easier to start from scratch and build it myself.
When I do this I want to add a reluctor wheel or whatever is needed for LinuxCNC to read RPM and be able to turn threads.
Any suggestions on what to get and how it should be integrated? And advice on setting up the config?
Or links to info on this topic, i have had no luck finding anything relevant.
When I do this I want to add a reluctor wheel or whatever is needed for LinuxCNC to read RPM and be able to turn threads.
Any suggestions on what to get and how it should be integrated? And advice on setting up the config?
Or links to info on this topic, i have had no luck finding anything relevant.
Please Log in or Create an account to join the conversation.
29 Mar 2017 20:53 #90522
by BigJohnT
Replied by BigJohnT on topic What do I need to add to turn threads
You need an encoder with an index pulse once per rev of the spindle. For rigid tapping you need a differential encoder.
JT
JT
Please Log in or Create an account to join the conversation.
29 Mar 2017 21:11 - 29 Mar 2017 21:41 #90523
by MAG45
Replied by MAG45 on topic What do I need to add to turn threads
Thanks, Can you share a link to get me looking in the right direction?
would this work if i made a sensor disk with a single slot/hole?
www.ebay.com/itm/1x-Slotted-Optical-Swit...f:g:W-QAAOSwyZ5Ungn9
would this work if i made a sensor disk with a single slot/hole?
www.ebay.com/itm/1x-Slotted-Optical-Swit...f:g:W-QAAOSwyZ5Ungn9
Last edit: 29 Mar 2017 21:41 by MAG45.
Please Log in or Create an account to join the conversation.
29 Mar 2017 21:46 #90524
by BigJohnT
Replied by BigJohnT on topic What do I need to add to turn threads
Don't have a clue if that will work and don't know what a shopmaster eldorado is. I don't think a single slot would work you need an A and B and a single Z (index) per rev. Have you looked in the Documents in the Hardware Examples section? Do a google search for rotary encoder.
JT
JT
Please Log in or Create an account to join the conversation.
29 Mar 2017 21:59 - 29 Mar 2017 22:01 #90525
by MAG45
Replied by MAG45 on topic What do I need to add to turn threads
ElDorado is a 3in1 mill/lathe I am using steppers to drive the axis. Everything I have read confuses me more so I thought i would ask here. I found some threads with this type sensor being used, but not much info on how.
Last edit: 29 Mar 2017 22:01 by MAG45.
Please Log in or Create an account to join the conversation.
29 Mar 2017 22:07 - 29 Mar 2017 22:09 #90526
by BigJohnT
Replied by BigJohnT on topic What do I need to add to turn threads
Did you read the Hardware Examples section of the Documents?
linuxcnc.org/docs/2.7/html/examples/spin...ml#_spindle_feedback
Looks like you need A and Z to single point thread.
JT
linuxcnc.org/docs/2.7/html/examples/spin...ml#_spindle_feedback
Looks like you need A and Z to single point thread.
JT
Last edit: 29 Mar 2017 22:09 by BigJohnT.
Please Log in or Create an account to join the conversation.
29 Mar 2017 22:13 #90527
by MAG45
Replied by MAG45 on topic What do I need to add to turn threads
okay, i didnt find those documents, i will do some reading
Please Log in or Create an account to join the conversation.
30 Mar 2017 15:08 #90569
by andypugh
Replied by andypugh on topic What do I need to add to turn threads
It is possible to thread with just a single pulse-per-rev. It is better to have more, but you do always need the single-pulse-per-rev channel.
Does the lathe have any gears on the spindle? You can add a gear-tooth sensor to get several pulses per rev, and possibly use a second (or third) sensor on a keyway to get the once-per-rev pulse.
Does the lathe have any gears on the spindle? You can add a gear-tooth sensor to get several pulses per rev, and possibly use a second (or third) sensor on a keyway to get the once-per-rev pulse.
Please Log in or Create an account to join the conversation.
30 Mar 2017 16:34 #90580
by MAG45
Replied by MAG45 on topic What do I need to add to turn threads
The lathe is run from a series of belts, the only gears we the original threading gear set up which i never used.
here is what im dealing with
drive.google.com/open?id=10P6yM2mA6uabLPSY8lxa_EZj_yo1x0sl3A
and this is the controller mess i need to redo and clean up
drive.google.com/open?id=1lWs5Ii5x4ljl0JxhRheHjJOPeuD7fFSzcQ
here is what im dealing with
drive.google.com/open?id=10P6yM2mA6uabLPSY8lxa_EZj_yo1x0sl3A
and this is the controller mess i need to redo and clean up
drive.google.com/open?id=1lWs5Ii5x4ljl0JxhRheHjJOPeuD7fFSzcQ
Please Log in or Create an account to join the conversation.
30 Mar 2017 16:58 #90582
by andypugh
Replied by andypugh on topic What do I need to add to turn threads
Is that a Mesa 7i43 in the bottom left?
And, what ratio to the spindle speed do the two unused threading gears turn at?
And, what ratio to the spindle speed do the two unused threading gears turn at?
Please Log in or Create an account to join the conversation.
Time to create page: 0.076 seconds