A square tubes looks not enough strong for me for aluminium machining.
I'm working on this frame for alu, with a smaller motors than what you want.
You should move the X ballscrow to lower. It is better between the 2 rails.
Everything looks welded. How can you do the end machining for a rails and others?
Info about what specifically?
I can't see who's post you are addressing and though it's obvious to you it's not obvious to me :-(If you will not be swayed by logic or experience simply pick the idea you
like best, but ask yourself why you sought advice in the first place and,
for a simple life, perhaps consider not doing so in future
The design is kinda crude, it was a fast iteration. I'll probably get some time in the weekend to upgrade it so the details is more understandable. The i'm going to add end plates to the large gantry square tube. Most of the machine will be welded. I have planned to bolt the gantry and base together at the bottom of the gantry legs. I guess I need to remove the aluminium part in the title of the post sinse it's mostly steel now.
Originally Posted by Lee Roberts
Last edited by PotatoMill; 17-06-2016 at 09:59 PM.
The cost of servos is going to be quite high, so i'll probably for closed loop steppers instead. However the ClearPath servos seems tempting. Is there any good reason to use servos instead of closed loop steppers?
Some cheap servos like the JMC can be similar price to most closed loop steppers, it'll be interesting to know if anyone has tested how their performances compare.
A cost of the servos is higher than what you think. E.g. you have to reduce the rpm, with 1:2 - 1:3 transmission. 1x zero backlash pulley is approx £30-40, one belt can be £15-20 and you need 3 set. With steppers, you just need a coupling.
Unfortunately I started with servos, but I could get a cheap set from China.
Thanks for the quick response Fenza and Remrendes
According to a quick estimate I did I dont think i'm going to need any more torque than what these closed loop steppers deliver; http://www.aliexpress.com/item/new-o...a-82b3fb4b4813
Estimates done with
-40kg weight of moving part
-130N force of cutter (excessive)
-10 m/s^2 acceleration (more than I think i'll need, but I haven built any CNC machines before so i'm not certain on this.)
Using T = (F*l)/(2*PI*n) where F is total force, l is lead per revolution, n efficiency
I get 0.44N well within
However I do know that theory and experience dont always match up. And in real life there could be some factor that make the estimate wrong.
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