Hi,
This is my first post. I built my first CNC router a couple months ago and learned a couple things that I want to rectify on my second router.
I'm now in the process of building my second CNC router.
To my regret I bought ball screws from China. More specifically linearmotionbearings2008. What a lot of rubbish this guy sells and what a waste of money.
My first machine has steppers directly coupled to 5mm pitch ball screws (1605's). I get very low IPM's from this method. Firstly due to the ball screws being bent and if I push the router too fast the ball nut will jam causing the motor to stall.
Secondly, with 5mm pitch screws I need to push the motor hard to get high IPM's.
I've now purchased much better quality screws and know I can push the router faster with confidence (no more jamming).
I was thinking of increasing the speed by using a timing pulley ratio increment like 2:1 (40 teeth on the stepper and 20 teeth on the screw) but I'm not sure if I will really gain anything this way. I will get double the speed at high torque but due to the gear ratio I will need double the torque for that speed. If you get what I mean.
1.) Will I gain anything from using a ratio increment using timing pulleys?
2.) What could you recommend to get higher IPM's with my setup?
Here are two links to videos of my current machine. The one video demonstrates the homing speed and the other the cutting speed. I'm happy with the cutting speed but the homing speed is too slow. I'm not even sure if the cutting speed is fast enough even though it seems reasonable.
https://youtu.be/FAkWd3ND980
https://youtu.be/HCIEoBdYUT8
I will appreciate your feedback.