Aluminium Framed Router

[lucan07]

Managed to get a couple of hours in over the weekend, and made some progress with Z axis, now have three smooth free moving axis and screws mounted for Y and Z still waiting on delivery of some parts so limited to working with parts already available. Time to start thinking about motor sizes required, being a novice I was surprised by the weight accumulation with the 20-30mm 5083 plate, rails, ballscrews etc used so need to work out totals and ensure adequate power from steppers drivers etc.,

[lucan07]

Progress being made not been able to keep up with posts as everything has been done in snatched moments as and when the free ones occured, all wired and connected ready for a test run tomorrow work permitting. Went with 5 axis BOB, 4 x DM542 4.2a drivers, 4 x 425oz Nema 23, 2.2kw HY VFD and Spindle, linkage I used 2:1 ratio from motors to 1605 ballscrews, power supply a pair of 36v 9.7amp units I had, option to swap in a pair of 48v 10.4amp will be available soon if it will be beneficial.

[JAZZCNC]

Why would you go with 2:1 ratio on 5mm pitch screw. This will be far too slow for router.

Also to make matters worse your only running 36V which means your your steppers are under performing by far margin, even with 48Vdc they will be running slower than they are capable of doing.

With 36v you'll be lucky to get 1000rpm and have any torque left. With 5mm pitch screw at 1:1 ratio that would only give Max feed rate of 5000mm/min. This halfs with 2:1 ratio. 2500mm/min is way to slow and this is Rapid speeds. Your actual cutting feeds will be in the 2000mm/min range which is way to slow for router.

Dump the ratio or better still swap the Pulleys around and go with 1:2 ratio. Up the voltage to 48v ASAP.

[lucan07]

My mistake ratio is 1:2 30 teeth on Motor 15 teeth on Ballscrew, I already had 2x36v power supplies on the shellf and have 2x48v being removed from machines being disassembled shortly so having deep pockets and short arms that is what I have used. The DM542 are only rated to 50v I believe so close to the limit available to me using these drivers.