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Forum topic by Acebull posted 08-05-2013 08:24 AM 857 views 0 times favorited 3 replies Add to Favorites Watch
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Acebull

2 posts in 1219 days


08-05-2013 08:24 AM

G;Day All Can I get some Help please I am hoping to build a 900mmX1500mm 3 axis cnc router and would like some input on what size stepper motors and leadscrews to use it will be a moving gantry type I will be useing Dual Vee Bearing for Linear movement it will be mainly from aluminium hope you can HELP me :) Thanks Ted


3 replies so far

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ChrisK

1809 posts in 2542 days


#1 posted 08-06-2013 01:04 PM

The larger NEMA 34’s will be sufficient. A 3 or 4 to one reduction for the larger, more mass, axis with a gear rack or ball spline drive works well. 900 mm is getting long for a lead screw spinning at 100 or more rpm. A 1/2-10 acme (inches) is a popular choice here in the states. It is strong and does not back drive.

http://www.digirout.com/index.html

These systems use a 34 motor to a reduction drive that is made from belt driven timing pulleys. The long axis is a rack and pinion, the cross axis is a ball spline, the z axis is a 1/2-10 acme. ( I have one of these machines)

http://buildyourcnc.com/blackFoot48v40.aspx

This type of machine using a chain drive and vee wheels is a great way to go. My design uses the chain drive, with 4 to 1 reduction off a nema 34 and sz 2 dual vee’s. I have yet to build it, but similar machine work just fine.

-- Chris K

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Acebull

2 posts in 1219 days


#2 posted 08-08-2013 08:35 AM

G’Day All thanks for your input what do you think of going 3/4 .500 4start lead screw for X&Y and 1/2 100 lead screw for the Z and Linear Rail for the motion the machine size that I want to build is 900mm X 1500mm I leave you to convert that as in Australia we are in metric I hope to do 2D/3D carving and scale model plane plan cut out

Ted

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ChrisK

1809 posts in 2542 days


#3 posted 08-08-2013 11:38 AM

3/4 – 1/2 is more than you need, but it will work. Keep the frame as stiff as possible and keep the weight as low as possible. Constant tug of war there. The 1/2-10 on the Z works well, you will be able to run 100 to 125 inches per minute.

-- Chris K

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