Messages

31

General Mach Discussion / Re: Mill cutting too big

« on: November 01, 2009, 06:27:04 PM »

forgot to attach pic.

Andy

32

General Mach Discussion / Re: Mill cutting too big

« on: November 01, 2009, 06:26:14 PM »

Hi Hood,

I have just looked at the wizzard, I can see no obvoius part to tell it where to start, attached is a screenshot. please note however this is on my 'inside in the warm' computer not the one with the issue.

Cheers,

Andy

33

General Mach Discussion / Re: Mill cutting too big

« on: November 01, 2009, 05:17:52 PM »

hi There,

phew thanks for the result of 400, it seems happy there and I did spend a day to get that result.

I am using a V carve engraving bit.  I used .2 as the tool diameter.

I will have to check the gcode, The test I ran was generated by the 'cut circle wizard' that ships with mach 3, I would be supprised if the wizard was wrong more likley it could be my key presses or lack of an enter.

Phil - Will post tommorrow.

Thanks to you both,

Andy

34

General Mach Discussion / Re: Mill cutting too big

« on: November 01, 2009, 04:11:08 PM »

Hi Hood,

They are steppers, I got them from DiyCNC.co.uk with the drv50 driver board.

it says they have a 1.8 degree and that I took to mean 200 as it states in the manual.

The leadscrew is a 20mm diameter with a 5mm pitch.  No gearing the motor connects via a coupler to the leadscrew.

I used 10 as a microstepping figure again as the manual suggests.

I got 400 due to trail and error with the auto config tool.

Hope the info helps.

Thanks,

Andy

35

General Mach Discussion / Re: Mill cutting too big

« on: November 01, 2009, 03:04:30 PM »

Thanks hood,

I have now set them to 400 which seems to be fine as when I move 10mm and measure it with calapers 10 mm has been moved (I havespent a whole day doing this)

However I ran the cut circle wizard and set the diameter to 12mm and guess what... it cuts at 24mm  any ideas?

Or are my steps per not so good?

thanks,

Andy

36

General Mach Discussion / Mill cutting too big

« on: October 31, 2009, 11:43:01 AM »

Hello,

I have recently converted a chineese mill into a cnc mill.

I have set the config up in mach 3 to run as metric.

The part I designed was done in bobcad, this is inteded to be a watch face.

as I cut the part I could see that it was not comming out as a 28.8 mm diameter but a 72mm diameter.

Can anyone help, I posted the problem in the bobcad forum and they reckoned there was somthing up with mach 3.

attached is my xml file of the mill.

Any ideas what could be wrong?

Thanks,

Andy

37

General Mach Discussion / Re: Muti-start threading....

« on: May 08, 2009, 10:35:30 AM »

Ok I will give the single start a go and post results.

A

38

General Mach Discussion / Re: Muti-start threading....

« on: May 08, 2009, 10:26:00 AM »

Ok will give it a go tonight and report back, I think my z axis is moving too quick!

A

39

General Mach Discussion / Re: Muti-start threading....

« on: May 08, 2009, 08:49:36 AM »

Ahhh, the Z was going at about 245mm/rev hmmm could this be the problem.  If so how do I get it to follow the speed set by the 'F'

A

40

General Mach Discussion / Re: Muti-start threading....

« on: May 08, 2009, 07:46:46 AM »

Hmmm tried it again with just two starts and it did not work, I must be missing somthing somwhere, should the z axis move at the lead as mine is going really fast?

I am using the sherline (metric) profile would there be anything in there?

Andy