Rigid tapping

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russkinch
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12 Oct 2021 11:34 #222922 by russkinch

Rigid tapping was created by russkinch

Good morning,
I am wondering if it is possible to do rigid tapping on my lathe with encoder-a and index only signals? If not, no worries as I have a tapping attachment. I have tried, but when the chuck reverses, the feed still goes forward, that would result in tap being broken.

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andypugh
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12 Oct 2021 14:03 #222936 by andypugh

Replied by andypugh on topic Rigid tapping

No. With only a single pulse channel the system has no way to know that the spindle has reversed direction.
It could possibly be done with a HAL component that considered the current position out of the encoder counter, the commanded direction of motor motion, and the motor speed. But nothing like that currently exists.

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russkinch
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12 Oct 2021 14:38 #222940 by russkinch

Replied by russkinch on topic Rigid tapping

Thanks Andy, I will buy another sensor like the other two I have. Once I have the Z, I take it the rest is automatic?

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anfänger
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12 Oct 2021 15:03 - 12 Oct 2021 15:04 #222941 by anfänger

Replied by anfänger on topic Rigid tapping

Yes if you have an encoder with a b and index rigid tapping on the lathe works fine.

Just remember when it reaches the given depth it will start to reverse the spindle. So if you have a long spindle ramp it will „over shoot“. But its only important if you tap closed holes till the end and have a machine wich takes some time to reverse the spindle (like mine where its 3-8 revolutions depending which gear I use)

Last edit: 12 Oct 2021 15:04 by anfänger.

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