If anyone wants to express an opinion (I've been wrong before lol) and I'm actually on topic for once Attached is a rack type system that seems "awfully good" Very generous .zip file size allowed! :cheers: admin.
Keith
Gerry
UCCNC 2017 Screenset
http://www.thecncwoodworker.com/2017.html
Mach3 2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM - CNC Dovetails & Box Joints
http://www.g-forcecnc.com/jointcam.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
I thought about the belt stretching.... but then, I'm only gonna be cutting mostly foam and balsa wood. once I get my table working properly and precise then I will try out some hardwood for firewalls and landing gear plates etc.. but if I can start cutting foam and balsa wood I will be a happy man
Check out www.sdp-si.com for a lot of good belt info.
If you take a look at the threads from Joe's design router, they're all using or switching to 1/2-8 2 start acme. Best performance for the price, and easier to implement than a belt drive.
Just a guess, but I'd say at least 90%-95% of the homebuilt routers here use acme screws with great results.
With a belt drive, you'll likely need a gear reduction which adds to the complexity.
Gerry
UCCNC 2017 Screenset
http://www.thecncwoodworker.com/2017.html
Mach3 2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM - CNC Dovetails & Box Joints
http://www.g-forcecnc.com/jointcam.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Dear rcbamm,
I didn't wish to pour cold water on the entire idea of belt drives. Far better men than me have had good results.
If you take a peek into the guts of $70 ink-jet printer, you will see a tiny belt driving the print head. The print head sprays stuff with incredible accuracy.
Good luck,
Best wishes,
Martin
Martin
harryn,
Any pricing from http://www.brecoflex.com/?CATID=1&SC...T10&codeName=M ???
I want to do a belt drive is 3/8" wide enough for the y axis? MIne is 65" wide so I was looking at 3/4"
Hi - I have not asked for pricing yet.
The belt drive site has a calculation setup for belt selection - I have not run the numbers yet. I think it has more to do with how much force you need than Y dimension.
I made an guess (based on comments in threads by others) that the gantry would have a mass approx 50 Kg / 100 lbs, and be driven by at least a size 23 motor, or in my case, more likely a size 34 - so approx 400 - 500 oz - in of torque. Only logic is that is what other people seem to be using.
I am toying with using a really wide belt (2 x for each axis) so that the belt tends to help stabilize things, at least that is the idea - so I am thinking 3 or 4 inches wide. Probably way overkill, and the idea might die once budget reality starts to hit.
With only a hundred pound gantry I don't think you would need a 2in wide belt if your driving it on both sides of the gantry. check out the specs on the belts. they handle more than it appears.