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Author Topic: Index pulse C3 and G540  (Read 14643 times)

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Re: Index pulse C3 and G540
« Reply #10 on: April 29, 2012, 01:14:16 PM »
OK, so now I tried to use the threading wizard  for a 24 tpi thread and it says Over max feedrate, The axis velocity on X is 100ipm and the rpm setting in the wizard is set to 177 rpm, what gives?

Jayson

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Re: Index pulse C3 and G540
« Reply #11 on: April 29, 2012, 01:18:41 PM »
X is not the axis in question it is Z that does the traveling for lathe threading.
Hood
Re: Index pulse C3 and G540
« Reply #12 on: April 29, 2012, 02:15:26 PM »
I meant the Z sorry, about the threading wizard, on the pitch, I thought I read somewhere that you input
the tpi for standard threads, is this correct? Or should I enter the pitch for a 24 tpi thread, which I think is 0.04167
I think?

Jayson

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Re: Index pulse C3 and G540
« Reply #13 on: April 29, 2012, 04:59:14 PM »
Jayson,
As it says on the screen... pitch...... which is 1/24 in your case.

If it say's  over max feedrate then you are trying to cut a thread with the motor rpm to high for the velocity you defined in motor tuning.

ou may want to take a look at Threading on The Lathe write up in  Members Docs.

RICH

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Re: Index pulse C3 and G540
« Reply #14 on: April 29, 2012, 05:11:27 PM »
I only ever do metric threads so always pitch, well when I say I only do metric threads I mean I only work in mm. If for example I am doing a BSP or UN or Whitworth thread I will divide 25.4 by the TPI to get the pitch in metric. Easiest way to do at the machine is use the DRO itself. In your case enter 1 into the DRO and click the enter on your keyboard then highlight the DRO again and press / on your keyboard then 24 (or whatever TPI) and when you press enter again on keyboard you will have the pitch :)
Hood

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Re: Index pulse C3 and G540
« Reply #15 on: April 29, 2012, 05:32:30 PM »
Hood,
Never new that ....... ??? just tried and works like a charm :)
How do you know these neat little lilttle things?

RICH

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Re: Index pulse C3 and G540
« Reply #16 on: April 29, 2012, 05:38:48 PM »
Just a tinkerer and try things no one else thinks of. For example MDI D1X10 or L1X10 or whatever letter you wish ;)
Hood

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Re: Index pulse C3 and G540
« Reply #17 on: April 29, 2012, 06:07:50 PM »
Hood,
Glad it wasn't D1x1000  as i would fall asleep waiting to get there, never the less, interesting  :D
got any others?

RICH
Re: Index pulse C3 and G540
« Reply #18 on: April 29, 2012, 11:06:00 PM »
Thanks everyone! , I just finally successfully turned a 1.37x24tpi thread for my friends Mtn bike, now I have to figure out
how to turn the left hand thread on the the other part haha!

Jayson

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Re: Index pulse C3 and G540
« Reply #19 on: April 30, 2012, 03:00:56 AM »
Rich
That one was found when I made a typo here at home, suppose its a bug in a way but really cant see how it would be harmful as the intention would be to do a G0 or G1 move anyway. The worst that would happen is if you had previously done a G1 move then commanded D0 rather than G0 the axis would move at the previous feedrate rather than a rapid.

Jayson
 Few ways to do a left hand thread.
1. Tool placed upside down and spindle reversed and feed normal direction.
2. Tool placed at opposite side of work, spindle reversed and feed in normal direction
3 Tool correct way up on normal side, spindle normal direction but feeding from chuck to tailstock.

With 3, you would have to provide an undercut at the start so that your tool doesnt rub whilst waiting for the index and also if your accel is relatively slow you would have to have that wide enough so the axis has a chance to accelerate to full speed before it starts cutting.
Hood