Different use of Mach3 (dispensing)

[GEORGETOUBALIS]

I finally finish the doming machine project.

http://www.youtube.com/watch?v=z5_H_WVbz98

The machine.
Parker linear motion tables 406 &404 series
Drives 750 OEM
Motors nema 34

All from ebay.!

[Overloaded]

Very nice George.
Well done !
RC

[GEORGETOUBALIS]

thanxs RC!

The 406 parker linear motion table hold all the mass of X and Z axis (about 70lb)
has 20mm lead and high feed rates is not a problem.
The X has lead 5mm and high fees rates is a problem.
If I change the frequency to 35000 or more my motors does not sound very well and I have noticeable vibration.
With 5mm lead the parker says that the maximum speed of screw can be 50 rps. but I can't catch that speed.
Any way may be I will change the 404 parker linear motion table with one that has 15mm or 20mm leed.
George!

[Overloaded]

George,
 Have you looked into the Smooth Stepper ?
It will produce a MUCH faster and cleaner pulse stream.
I have one but have not used it yet but hear nothing but good news about them.
RC

[GEORGETOUBALIS]

RC
The parker OEM 750 are very good drives with impressive characteristics and 3-4 times more expensive than Smooth Stepper
 plus they can handle 75VDC 6-7Amp That means speed and power.
http://www.arcetri.astro.it/irlab/doc/OEM750%20User%20Guide.pdf
I think that I push them to hard. Or my PC is slow (3.2 Ghz with XP).
Or maybe the power supply is small (75VDC 10A) maybe I need 20A.
the 3 drives is configured to give 6.8A/drive.
George.

[Tweakie.CNC]

Fascinating doming machine you have there George.

Tweakie.

[GEORGETOUBALIS]

thanxs Tweakie!

[Petergough]

Hi George,
I think you are correct,
power supply needs upsizing,
2 jobs I have done to date,
found best to oversize by 10-20% of
the max current per drive x number of drives,
we have 4x 6 amp motors, power supply is 30 amp,
this help when braking heavy loads as power ploughed back in
on deceleration has somewhere to be absorbed,
some good info on the Gecko site.
Great machine/idea
regards
peter

[fer_mayrl]

George,
What did you end up using for precisely dispensing the resin?

Great work, i love to see machines controlled by mach3 that are not lathes and mills.

Regards
Fernando

[Glenn]

Hi George,
  Great machine!
   This may be a dumb question, but does your machine "find" the
object to dome with the cross hair laser light seen in the video?
  It appeared that you laid the second tray on the spoil board
without aligning it or fastening it to a pre-measured spot. How does this work?
  Thanks,
  Glenn