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Author Topic: AL54b (lathe) project from New Zealand  (Read 165697 times)

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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #250 on: April 23, 2015, 01:02:35 AM »
Quote from: rcaffin on April 22, 2015, 08:26:47 PM
In Config /Ports&Pins you will need to use the settings in Spindle / motor control and special functions. I think you have dealt with these already.

Done

In General Config at top right hand corner you have Input Signal debouncing. For Index Debounce you may need a value of 0. I do.

Done (default is 0)

Under Pulleys you need to set the RIGHT ratio, and you need to calibrate the Z axis (lathe) correctly as well.

Done

OK, you seem to be threading OK; you just need to get the pitch right.

Correct

Um - just checking: you have only ONE index pulse per rev, yes?

Correct

Cheers
Roger


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Offline rcaffin

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Re: AL54b (lathe) project from New Zealand
« Reply #251 on: April 23, 2015, 02:34:05 AM »
Hum ....
What feed and speed are you using?

Cheers
Roger
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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #252 on: April 23, 2015, 04:41:22 AM »
200-400 rpm .2 per pass, threads look good, the pitch is wrong
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Offline rcaffin

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Re: AL54b (lathe) project from New Zealand
« Reply #253 on: April 23, 2015, 06:41:32 PM »
> 200-400 rpm .2 per pass, threads look good, the pitch is wrong
Steel, brass, aluminium?

Belabouring the obvious, but perhaps you could run a quick check over the Z feed calibration and the RPM once more. There has got to be an error somewhere, as I routinely thread accurately with Mach3 myself.

Cheers
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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #254 on: April 23, 2015, 09:23:08 PM »
Ali 20mm stock 1.5mm pitch been playing with 2mm as well.

Z axis is accurate, am thinking about how to check the RPM still, ideas are welcome
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Offline rcaffin

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Re: AL54b (lathe) project from New Zealand
« Reply #255 on: April 24, 2015, 01:24:57 AM »
I have noticed on my machine that even with my best efforts, commanded RPM and actual RPM, as displayed by Mach, are not always exactly the same... The (Mach) displayed speed should be fairly accurate.

I did eventually use the Mach spindle linearisation routine in one of the menus to improve that.

Cheers
Roger
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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #256 on: April 25, 2015, 02:25:48 AM »
I just cut the best 1.75mm tread I have ever cut in my life! I rand the same Gcode over and over again, after the first run I never saw chips again, it is perfect.
Same problem, had to set the pitch to 4mm to get the 1.75mm thread.

Can anyone tell me:
1. are you using the default mach3 wizard?
2. are you using imperial or metric as your default setting?
3. are you able to cut metric threads with the wizard?

I'm off to the Marshal Islands for a couple of weeks so wont be able to test anything but would appreciate the help all the same.

cheers
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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #257 on: April 25, 2015, 02:27:26 AM »
Quote from: rcaffin on April 24, 2015, 01:24:57 AM
I have noticed on my machine that even with my best efforts, commanded RPM and actual RPM, as displayed by Mach, are not always exactly the same... The (Mach) displayed speed should be fairly accurate.

I did eventually use the Mach spindle linearisation routine in one of the menus to improve that.

Cheers
Roger


I don't think this matters so much, from what Ive read mach will adjust the Z feed based on what it is picking up from the spindle true pulses anyhow.

Cheers
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Offline rcaffin

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Re: AL54b (lathe) project from New Zealand
« Reply #258 on: April 25, 2015, 02:34:25 AM »
Quote
I don't think this matters so much, from what Ive read mach will adjust the Z feed based on what it is picking up from the spindle true pulses anyhow.
True, quite true.
I just wanted my machine to be a bit more 'linear'.

> 1. are you using the default mach3 wizard?
I have used the wizard; the rest of the time I hand code. Both work for me.

2. are you using imperial or metric as your default setting?
METRIC

3. are you able to cut metric threads with the wizard?
Yes.
In general I don't use imperial at all.

A ratio of 4:1.75 (or 16:7) is really wierd!

Cheers
Roger
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Offline jrslick22

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Re: AL54b (lathe) project from New Zealand
« Reply #259 on: May 10, 2015, 05:39:44 PM »
baring figuring out what thread pitch to put in with a ratio to cut it right I am officially out of ideas.
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