One of the bolts on the spindle sheared off, the other 3 are still on so it’s functioning still but needs to be addressed. Running the risk of the spindle dropping down if it comes loose
I’m not super convinced this is a big deal, it kinda just dropped out like it was put there like this already. Just want to make people aware, spindle may function fine with only 3 bolts but I don’t know
If you can measure the length and threads on that bolt, it would help get it replaced. There is a thread checker in the metal shop.
@jamesfreeman to make the call on the red tag or not
Did we move up bolt size(diameter) last time? Is there physical space for a 3rd bolt on each side?
We didnt. The plate behind the spindle is tapped for the bolts. Going to research if there are physical upgrade worth doing. ait might just be easier to have spare bolts on hand and put them on a scheduled replacement.
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The bolts are still M6-1.0. The last time they were replaced we had to grind them down to length. They are held by nyloc nuts. @morrism14 is picking up replacement bolts but we are guessing they just backed out.
Tapping a larger hole and/or using loctite may be a good solution
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If some machining needs to be done, I can help with that.
When it gets re-installed, please move the spindle up as high as possible. That’ll help get more Z height for use with the rotary.
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I got the bolts and some blue Loctite. I’ll go by today and drop them off. I’ll see if I have time to reinstall the bolts.
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I can confirm that the bolts sheared.
Yes there is space for an additional bolt on each side. However we would need a slot milled in the back of the mounting plate to receive a nut unless we tap directly into the mounting plate. Current setup uses nyloc nuts in slots.
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I propose upgrading to stainless steel bolts for now. If it ever happens again we can add additional bolt holes or drill and tap for larger bolts.
I have some replacement black oxide bolts I picked up today to get it up and running again.
I’ll be able to reinstall them later today. I dropped them off.
I’ll look into getting stainless bolts.
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I think the normal grades of socket head cap screws are stronger tensile strenth than stainless.. but maybe stainless would be less brittle, and not snap off like that.
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I was thinking the same. Are the current bolts class 12.9?
Current M6 bolts are 12.9 per American Bolt. @atwatsoniii if you’re up for it and if James allows, we might enlarge the front and back counterbores and try M7 or M8.
I think the 4 M6 bolts are too few. The clamping force is spread over too few bolts and the high vibration environment is tough. The typical torque is 23 ft-lbs.
I would actually use grade 10.9 over 12.9 since it is a high vibration environment 12.9 is the highest strength but has the least amount of give
If you are upsizing and or adding more holes, I would consider using precision shoulder screws.
another option; you could add two center dowel pins in between the m6.
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I have replaced the bolts and got it back running, raised the spindle a little bit for rotary clearance, and trammed. However, in testing the system I noticed severely reduced suction from the dust collector.
After investigating I found that only one of the 3 motors in the dust collector are running. I’m not sure what is preventing the other two from turning on. I verified wiring and that they can freely spin. The instructions mention a heat overload reset switch, however, I wasn’t able to located the switch
described. Additionally the reset switch described seems to be for all motors.
I fear they may have burnt out. I wonder someone can contact Oneida and check if there is indeed an overheat reset switch somewhere or if these motors have failed and need to be replaced.
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Nevermind, I found their instruction video. We dont have the thermal overload protection upgrade kit. I fear these motors may have burnt out.
I took out the filter and it was incredibly blocked with superfine dust. I took the filter outside and cleaned it.
