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Old Mon 12 August 2013, 01:24
Just call me: Eric #115
Sacramento, CA
United States of America
Welding the bolts that the motor plates mount onto...?

So, as I've struggled with reaching around to tighten the bolts that the x-axis (and the y-axis too, I suppose) motor plates mount onto (the bolts that the teflon washers go onto)...

I scratched my head and wondered why no one welds those bolts in place. It seems like 30 seconds of welding will keep it pretty permanently in place, or is it largely so that if the bolt wears out it can be replaced that they aren't permanently attached? Seems like one point where a bit of welding would only make things easier to modify/work on in the long run. Trying out different motor plates, etc. could all be accomplished from the 'outside' of the machine without needing to reach around to the inside with an allen wrench.

Am I missing something? Anyone else done this? Thoughts?
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Old Mon 12 August 2013, 01:41
Just call me: Paulo #108
Netherlands Antilles
You need to do a slot on tip of the screw (it's explained somewhere). then, with a flat screw driver you can hold the screw from outside of the machine, it's easy.
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Old Mon 12 August 2013, 01:45
Just call me: Eric #115
Sacramento, CA
United States of America
You know, now that you mention that, I think I remember coming across that early in the build, and probably just forgot to do it at the time. Thanks. :-)
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Old Mon 12 August 2013, 06:02
Just call me: Ken
I don't like to weld screws. Always ruin the threads. Maybe its just my substandard welding skill.
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Old Mon 12 August 2013, 09:44
Just call me: Sean - #5, 28, 58 and others
Orlando, Florida
United States of America
If you haven't already, just hold the machine screw in a vise and use either a very narrow kerf cut off wheel or hacksaw, and cut a slot in the end of the bolt.
This allows for you to use a standard flat screw driver to hold the screw while setting the nut.
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Old Mon 12 August 2013, 11:58
Just call me: Russell #69
Mobile, Alabama
United States of America
You can also make your own wrench out of steel that is thin enought to fit inbetween. I was lucky, one of my routers had the same size wrench for the collet nut. (Ryobi)
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Old Thu 15 August 2013, 15:37
Just call me: Travis #75
United States of America
Sounds like a good idea to add to the laser kit. Draw one up and have them cut with the parts....
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Old Wed 06 November 2013, 07:27
Just call me: Eric #115
Sacramento, CA
United States of America
For those that are curious... The reason NOT to weld the bolts is to make sure that you have clearance to fit the motors onto the now-welded bolts without the gear interfering (running into) the gantry ends or the Y-car ends. Depending on the hole you use, it can be a problem. Smaller pinion gears might not have the same issue.
Anyway, I welded the pivot bolt for all my motors, and I'm REALLY happy with that. The one on the opposite end, I slotted as advised, as I can't get my motors onto the machine if it were welded in place. Contemplated cutting a clearance 'arch' for the gear to fit through, but decided that the design is perfectly good as it is as long as I don't try to get silly or fancy. :-P
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Old Thu 07 November 2013, 03:25
Just call me: Ross #74
Eric this is what you need to do

Hi All

This was an issue for me too so....

1. Slot the bolt with a thin disk
2. Use two nuts locked against each other for a never come loose fixture
3. Broaden out the contact area of the washers to spread with load

I have been meaning to actually let everyone know about how I handed this one for a while but when this came up, it was my reminder.
You might need a longer bolt than the plans specify but it s a great fix for nearly everything that could happen regarding that joint.


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