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Messages - SteinarN

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41
General Mach Discussion / Re: Problems threading on the lathe
« on: October 04, 2009, 02:11:03 PM »
Some time ago I read the thread in it's entirety. I have since followed it closely. It have been very interesting reading and I,m very impressed on the effort laid down by everybody in trying to get the threading to be as good as possible. I have thought a few times on saying something but have decided to keep shut as I probably not have had something useful to say.

The last post by RICH where he says the lead is decreasing is however particularly interesting. I have been thinking since some time ago on the fact that Mach can't speed up if that was necessary in order to catch up on an increasing spindle speed. The thought I have had is what if the spindle speed measurement done just prior to each pass is slightly slower than the actual spindle speed when threading occur. Then the pitch will be to large. I understand the spindle speed is measured in only one revolution prior to the threading on each pass. It places a huge demand on the exact measurement of the time between those two index pulses on that one revolution. When threading at say 500rpm, that is 3,000 degrees/second or 333 µs/degree. I have been thinking on what is the repeatability of the index trigger. An error of a couple hundred µs of the exact time of the trigger signal and the wrong way may cause a noticeably deviation of the pitch on long threads, especially at high rpm's.

I hope I remember the previous posts by ART correctly as what I have said now else definitely would be incorrect. It may very well be incorrect even if I remember ART's previous explanations correctly. In that case disregard what I have said here.

Steinar

42
General Mach Discussion / Re: Tangental Cutter problem!
« on: September 16, 2009, 07:02:26 AM »
How does mach3 know the position of the Z-axis? does it have an end switch telling mach3 the position?

43
Screen4 does not support insertion of a background image larger than what fits inside the borders of Screen4 on the actual computer where Screen4 is used. That is Screen4 does not support scrolling of the background image or anything placed on it.

In order to design a screen set with a resolution of 1280x1024 you ned to do the actual design work on a larger screen like 1600x1200.

44
Show"N"Tell ( Your Machines) / Re: single phase vs 3 phase VFD's
« on: July 03, 2009, 06:59:58 AM »
Some VFD's like some models of the small Danfoss VLT2800 series can be hooked up to either 3-phase or single phase. This is stated in the VFD manual. If the manual says the VFD is to be hooked up to 3-phase without mention single phase it is probably not able to function correctly if hooked up to single phase only.

45
FAQs / Re: A Axis Setup as Degrees
« on: June 17, 2009, 08:25:45 AM »
When you have checked "A-axis as angular" and configured your steps per unit to achieve 360 units = one complete rotation you may choose a couple other options. Namely the "Rot 360 rollover" and the "Ang Short Rot on G0".  Play with these options and put G0 and G1 moves in the mdi line to see what happens.

As Greg asks, how do you see Mach threats the A-axis in mm and not in degrees?

46
General Mach Discussion / Re: Major/ minor arcs in turn
« on: June 03, 2009, 06:02:28 PM »
I think I should buy a book explaining how to make g-codes.
One question, is it required to use I/K codes instead of R codes when making a part with arcs which would require both checked and unchecked Reversed Arcs in R codes?

47
General Mach Discussion / Re: Major/ minor arcs in turn
« on: June 03, 2009, 03:14:13 PM »

48
General Mach Discussion / Re: Major/ minor arcs in turn
« on: May 31, 2009, 04:23:40 AM »
Hood, just out of curiosity, if you want one major arc and one minor arc on the same work piece, how do you do it then?

49
General Mach Discussion / Re: Major/ minor arcs in turn
« on: May 31, 2009, 01:55:33 AM »
I'm going out on a limb here.
Have you tried to use a negative value for the R? What happens then?

50
General Mach Discussion / Re: Major/ minor arcs in turn
« on: May 30, 2009, 03:36:40 PM »
What is major and minor arcs?

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