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Messages - Thys

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1
General Mach Discussion / Re: What TPI for new cnc machine?
« on: October 04, 2011, 02:52:29 AM »
WOW, some excellent comments, thanks thanks thanks!!
yes, Gerry, I don't need that accuracy as stated. I am happy with what you recommend at 0.1 or 0.2mm
thanks all for taking time to help me. I REALLY appreciate it.
Thys

2
thanks so much guys, I think you have nailed it on the head. I will try and improve the setup. Thys

3
General Mach Discussion / loosing the z axis position during cutting???
« on: October 03, 2011, 03:49:02 PM »
I have no other way to title this, but let me elaborate,

I use cambam to generate G code and run a program in Mach 3. My lead screw for the z axis is an m8 metric thread with a pitch of 1.25mm. my x and y axis are on a sprocket and chain system and can attain much higher speeds than the z axis. When cutting tonight and 1200mm / min, it seems that the z axis gets out of calibration / position or something as half way through the process, mach 3 shows 3mm above surface, but the spindle is virutally on the wood. ( at position zero) then later, it's even further down at -2 or -3 and mach 3 says the spindle should be at 3mm.

I am not sure but could it be when the spindle jumps over the triangular tabs which cambam makes, it is a little too fast for the metric lead screw to wind up and wind back down again?

It is really frustrating as you could imagine as I loose good wood in the process and waste.

any comments or assistance would be greatly appreciated,
Thanks
Thys
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4
General Mach Discussion / What TPI for new cnc machine?
« on: October 03, 2011, 03:33:20 PM »
Hi All, a question posted to a good cnc friend Tweakie, but he advised me to rather hear what the forum had to say, so your input would be greatly appreciated.

I am busy designing a new machine and want to use it primarily for cutting wood on a flat table. I am thinking of a cutting area around 1.5m square.

I am able to have my own lead screws (ACME) cut to whatever pitch I want. I wanted to ask you advice on this. What tpi would you recommend me going for based on the application. I would like to cut in the range of about 1000 – 2500 mm per minute and accuracy, although important, is not critical to the 0.01 mm. Or do you think that is a little fast for cutting wood?

If the lead screw option in the wrong one, what other method would be advised for moving the axis (plural)

Any comments would be appreciated
Thys

5
General Mach Discussion / Re: what software has this interface?
« on: August 10, 2011, 06:37:50 AM »
Join the riots in manchester, Grab and big screen telly and sell it, use the money to buy Rhino
:)

hectic stuff I hear going on there!! stay safe!

6
General Mach Discussion / Re: what software has this interface?
« on: August 10, 2011, 03:58:42 AM »
thanks Hood. means I have to fork out another few Rand!!

7
General Mach Discussion / Re: what software has this interface?
« on: August 10, 2011, 01:54:00 AM »
hi Guys, thanks so much. yes it is Rhino. now to download the evaluation version and get cracking.
Does anybody know where I can find some good tutorials on to get started. Also, is it only a CAD program or can one transfer the item created directly to G code and then to Mach 3?

thanks again
Thys
:)

8
General Mach Discussion / Re: what software has this interface?
« on: August 08, 2011, 10:04:49 AM »
hi Tweakie, thanks, but I am confused. this image is a snapshot of a video clip of an industial design student making a wood bowl using some sort of cad program and a cnc machine. I was wondering if anybody recognised the program he was using from the snapshot of the interface. thanks
Thys

9
General Mach Discussion / what software has this interface?
« on: August 08, 2011, 07:45:29 AM »
hi guys, have a look at this image software snapshot. do any of you recognise the interface. what software is this?
thanks
Thys


10
hi Guys, just putting this one out there again for any help or comments

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