New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Moderator: cnckeith
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Uwe, Are you getting repeatability when you install the probe each time or do you have to check run out each time?
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
since I am using a quality chuck and clamp the probe allways in the same orientation of the chuck, it repeats within 0.03mm diameter deviation of the turned parts.
For better precision you have to go with 2 finishing passes and set tool wear since deflection of the machine depends also on the cutting force.
Uwe
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Uwe, Did you wire your tool touch for the lathe as a tool touch or as a probe? Do you mind referring me to the page in the probe set up guide that you used for your wiring?
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
The Probe guide is for mechanical probes, but this here is a NPN probe. Wire like an NPN sensor (but to ProbeTripped input, set this input to NO):
https://www.centroidcnc.com/dealersuppo ... 955.r4.pdf
Connect 4th pole of the plug to ProbeDetect input. Set this input to NO
Make a jumper on the plug from the probe to the 4th Pole and COM.
There is a Picture in the photo album.
https://photos.google.com/share/AF1QipM ... NqcUZtQU5B
This way, if you plug in the Probe, ProbeDetect is set and Probe protection is on.
Uwe
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Posted here by mistake sorry. So I’m deleting it. ![Embarrassed :oops:](./images/smilies/icon_redface.gif)
![Embarrassed :oops:](./images/smilies/icon_redface.gif)
Last edited by BillB on Tue Jul 12, 2022 7:16 pm, edited 1 time in total.
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
run out of the probe must be mechanical adjusted.
Use a lever type indicator like this:
https://www.girodinstruments.ch/en/product/gt-1452-r/
Uwe
Use a lever type indicator like this:
https://www.girodinstruments.ch/en/product/gt-1452-r/
Uwe
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
Hello Uwe.
Can you tell me what transmission ratio you use for your Z axis and the diameter and pitch of the ball screw?
I am also thinking of switching to a servo on the Z axis and I would like to do exactly the same assembly as you.
It seems to be really effective. Cheer
Can you tell me what transmission ratio you use for your Z axis and the diameter and pitch of the ball screw?
I am also thinking of switching to a servo on the Z axis and I would like to do exactly the same assembly as you.
It seems to be really effective. Cheer
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Re: New Build, PM2700 lathe with Acorn, Videos and Photos <upgraded to AC servos>
5mm pitch and 2:1 reduction. This can go 15m/min rapids, but I limited to 10 m/min because this ist about the critical rpm of the ball screw.
Uwe
Uwe