Hi All,
I have just replaced the x axis stepping motor on my Chinese laser.
The old x axis was 0.9° 42BHM39-100-15 stepper motor and struggled to get a match, I sent specs to Start Now Lasers in China, they sent me a motor which they said was a match but when installed its not working correctly, it turns out its a 1.8° motor. My machine is not returning to same home after cutting, rastoring or vector, nothing working as it should. Do i need to change the y axis motor to 1.8° aswell, do i need new drivers? Any help or advice would be much apreciated.
Thanks Doreen
there are no parts to wear in a stepper motor but the bearings and those can be replaces. I had the same problems as you, ie hard to find a .9deg stepper but bearings are easy-ish.
you can get the 1.8deg motor to work by changing the steps per mm setting in your controller config. if it’s GRBL you can open the console window and type $$ to get your configuration. $100 is your X axis steps per mm but remember, you’ll lose half your resolution. Just try halfing the number in $100 and see how it goes.
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Hello, I had the same problem 2 years ago. This is the stepper motor I had to replace (It was skipping steps).
In my case, I didn’t want to compromise on the resolution, so I had to do some extensive internet research and managed to find a diagram with my motor’s specifications (Driving a Bipolar Stepper with the TB 6600 v1.2 Driver - Robotics - Arduino Forum)
and a company on Alibaba that manufactured them (https://faradyi.en.alibaba.com/?spm=a2756.trade-list-buyer.0.0.7ae376e9hs0rzQ&tracelog=from_orderlist_company) to the same specifications.
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So you just bought a bunch of them?
It is a manufacturing company, I was lucky that they accepted a minimum order of 5 units.
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Well, you never know…
At least I know now where to ask in case I need one. I had an issue with my Y-axis months ago, but it wasn’t the stepper - I killed some circuits on my board by moving the rail by hand without releasing it…