X axis lead screw broke off at motor inside coupler. I am waiting on tech support ticket to go through and see what is needed but checking to see what you guys suggest as the fastest way to get back running. I haven’t measured the milled down part of the shaft at the motor coupler side, looks like .25". On the opposite side looks more like 8mm not sure yet, will check in a bit. It snapped off while cutting a part mid line, didn’t hit anything. Actually it may not be milled down, maybe they drilled it and stuck a dowel inside it.
Get the correct one from Langmuir. Yes, the machined end is .250. I have only seen it several times on the forum. They can overnight one pretty fast.
I don’t know the acme size and pitch. Some of our rocket scientists will know if you want to make one yourself.
Thanks. I had a 1/4 to 1/2 coupler laying around and it fit perfectly. I’ll see what they say when they get back to me from tech support tomorrow but it may be fine as is.
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Always good to save good shit. Loose couplers lying around are a plus…
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I had this happen to me before. We did a temporary repair and Langmuir was kind enough to send out a replacement.
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I think the 1/4" shaft is inserted into the end. Mine broke off the same way as your photo. These McMaster parts fit perfectly to join the 1/4 motor shaft to the 1/2" shaft.
McMaster Parts to fix broken 1/4" end section
9845T2 1/4" inside diameter
9845T2 1/2" inside diameter
9845T14 spider
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I’m on my 3rd one! Breaks off at the shoulder. Thought it way have a mount out of square or something. I removed the lead screw and moved the gantry by hand and felt it was set too tight. I went through the instructions again and trammed the gantry one more time. This time, the gantry was definately square and moved much easier by hand which causes less binding on the motor and less stress on that tiny end that is held by the coupler. I also put some blue LokTite on the two shafts before reconnecting and tightening the coupler. I additionally added white pen withness marks to the coupler and right on the lead screw so I’d be able to tell if there was any slippage. Theres no way to leave a witness mark on the motor shaft though. I also double checked my lead screw nut and mount with the gantry at the far right extremes of the machine making sure they were tightened properly. Hope this helps.
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