7i76E for lathe conversion
- toplakd
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29 Jan 2016 08:35 #69221
by toplakd
7i76E for lathe conversion was created by toplakd
Hi.
Im using Linuxcnc for 5 years now on my milling maschine with LPT BOB.
As now I'm converting a lathe to CNC I was thinking if the Mesa 7I76E is a way to go.
I would like to control 2 Stepper motors, VFD, spindle index and limit/home switches.
Is this card suitable for such conversion or is something additional needed for the Spindle index control.
Spindle index on machine will be with slotted disc and 2 optical sensors, one for index and one for speed.
Thank you for your answers, Dejan
Im using Linuxcnc for 5 years now on my milling maschine with LPT BOB.
As now I'm converting a lathe to CNC I was thinking if the Mesa 7I76E is a way to go.
I would like to control 2 Stepper motors, VFD, spindle index and limit/home switches.
Is this card suitable for such conversion or is something additional needed for the Spindle index control.
Spindle index on machine will be with slotted disc and 2 optical sensors, one for index and one for speed.
Thank you for your answers, Dejan
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- andypugh
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02 Feb 2016 13:58 #69439
by andypugh
Replied by andypugh on topic 7i76E for lathe conversion
The 7i76 has an encoder counter for the spindle, so should work perfectly for your needs.
If you can, add more slots to get better threading behaviour.
Make one slot deeper to be the index.
Note that the 7i76E will _not_ work with a LiveCD installation. You need to install a normal Linux version then install the PREMPT_RT kernel package, then install LinuxCNC.
linuxcnc.org/docs/2.7/html/getting-start...nate_install_methods
If you can, add more slots to get better threading behaviour.
Make one slot deeper to be the index.
Note that the 7i76E will _not_ work with a LiveCD installation. You need to install a normal Linux version then install the PREMPT_RT kernel package, then install LinuxCNC.
linuxcnc.org/docs/2.7/html/getting-start...nate_install_methods
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- toplakd
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02 Feb 2016 14:02 #69440
by toplakd
Replied by toplakd on topic 7i76E for lathe conversion
Hi.
Thank you for your reply Andy.
Slotted disc is in plan, with 100 slots of which 1 will be deeper for the index.
Two optical switches, one of them for index. Will two of them be enough?
Yes, I have read that I need different kernel package here in forums.
So there is no need for any additional output boards as all can be connected to 7i76e?
Thank you, Dejan
Thank you for your reply Andy.
Slotted disc is in plan, with 100 slots of which 1 will be deeper for the index.
Two optical switches, one of them for index. Will two of them be enough?
Yes, I have read that I need different kernel package here in forums.
So there is no need for any additional output boards as all can be connected to 7i76e?
Thank you, Dejan
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02 Feb 2016 14:07 #69441
by andypugh
Replied by andypugh on topic 7i76E for lathe conversion
If you can set up an extra B sensor in quadrature with the A sensor then you can determines spindle direction as well as speed, and that means that you can rigid-tap with a tap held in the tool post.
For the cost of an extra opto you might as well.
For the cost of an extra opto you might as well.
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02 Feb 2016 14:08 #69442
by andypugh
Well, you would still need stepper drivers. I would be tempted to look at using the new-fangled closed-loop steppers.
Replied by andypugh on topic 7i76E for lathe conversion
So there is no need for any additional output boards as all can be connected to 7i76e?
Well, you would still need stepper drivers. I would be tempted to look at using the new-fangled closed-loop steppers.
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02 Feb 2016 14:10 #69443
by toplakd
Replied by toplakd on topic 7i76E for lathe conversion
Hi.
Yes, I know I need stepper drivers and steppers.
Plan is to use Leadshine ESD + 8Nm (N34) on Z and 3Nm(n24) on X.
Yes, I know I need stepper drivers and steppers.
Plan is to use Leadshine ESD + 8Nm (N34) on Z and 3Nm(n24) on X.
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