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Author Topic: C3 - Index Pulse Card  (Read 12781 times)

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Re: C3 - Index Pulse Card
« Reply #20 on: July 15, 2012, 12:41:44 PM »
I installed the Mach3 R3.043.062 Development version yesterday. Maybe it is better with the Lockdown version?
I will do some more testing with the threads tomorrow.

Ok, thank you for the info, I was not sure about the 440 value.

Offline Hood

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Re: C3 - Index Pulse Card
« Reply #21 on: July 15, 2012, 01:52:30 PM »
I am not sure if it would make any difference as it is the driver that controls the threading and I dont think there have been any driver update. Worth a try though I suppose.
One other thing, I notice you have an Index Debounce of 10, have you tried lower?
Hood
Re: C3 - Index Pulse Card
« Reply #22 on: July 15, 2012, 02:14:47 PM »
Ok, I will try the lockdown version tomorrow.

No I have not tried that, I am not sure what the Index Debounce is / does?

Offline Hood

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Re: C3 - Index Pulse Card
« Reply #23 on: July 15, 2012, 02:22:23 PM »
Index debouce filters the index pulse input, it means Mach will not act on a signal unless it is seen for the specified amount of time, in your case 400uS. When I was using an opto I found that if I used any more than Zero the index pulse and RPM would be  a bit erratic. What you will need there will vary depending on hardware used but no harm in trying lower.
Hood
Re: C3 - Index Pulse Card
« Reply #24 on: July 15, 2012, 02:33:20 PM »
Thank you for that info :). I will try this tomorrow... I will post some results here.

Thank you for all your help here the last couple of days, I really appreciate if.

Per
Re: C3 - Index Pulse Card
« Reply #25 on: July 20, 2012, 05:01:06 PM »
Hi!

I have tried alot of differnt threads now and they are getting better and better :). I tried lower Index Debounce numbers and I think that was a good thing for my equipment.
But if a do a long thread, 50mm with 1.5mm pitch, the first 20-30 mm will be perfect but the rest can be a bit off. The pitch seems a be increasing towards the end om the thread...
Any good suggestions for this?

Per

Offline RICH

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Re: C3 - Index Pulse Card
« Reply #26 on: July 20, 2012, 05:26:01 PM »
Per,
The cut pitch can only be as accurate as the the axis feeding it and Mach setup. If the Z axis has a gain in it's pitch it will be reflected in the cut.
If the motor rpm increases during the threading then same can occur.The pitch can seem to be increasing if the cut depth is not constant.
If you do a scribe test and then measure you can minimise / eliminate some of the actual cutting and other affects of the machine.
The threading cycle was  tested based on fig 4.4.5 in the Threading on the Lathe write up. If all is working correctly you would have difficulty
 measuring a change in lead for a 50mm / 2"  thread length from a software point of view.

Have fun threading,
RICH

Re: C3 - Index Pulse Card
« Reply #27 on: January 12, 2013, 11:04:48 AM »
Hi!

I have tried alot of differnt threads now and they are getting better and better :). I tried lower Index Debounce numbers and I think that was a good thing for my equipment.
GBut if a do a long thread, 50mm with 1.5mm pitch, the first 20-30 mm will be perfect but the rest can be a bit off. The pitch seems a be increasing towards the end om the thread...
Any good suggestions for this?

Per

I have been having this exact issue. The thread is perfect for the first 20mm and then it deteriorates.  Did you ever fix this problem??

Offline Hood

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Re: C3 - Index Pulse Card
« Reply #28 on: January 12, 2013, 11:48:13 AM »
spencyg
Cant remember if I asked you the version of Mach you are using?
Hood
Re: C3 - Index Pulse Card
« Reply #29 on: January 12, 2013, 12:15:21 PM »
I just recently downloaded the released version. I think it is the latest release.