Another dumb question from a newb. After assembly, I started building the shelf underneath the 4x4. I noticed about 7 tiny ball bearings on the floor. The assembly instructions stated to not unwrap the gantry when flipping the table as to not lose the bearings. Questions is, what size are the bearings that I could have lost when I flipped the table by myself? Thank you
Ball screw balls are tiny ⌠but simply turning the table over should not cause an issue unless the ballscrew nut was run off the screw somehow. I think the âdo not unwrapâ warning exists because once the ball nut is free to move (unwrapped), it has very little friction and it is extremely easy to make a mistake and run the ball nut past the end of the screw.
I wonder if they are 3/32" (approx. 2.38 mm) in diameter. Those I believe are the standard size used in the HGH15CA linear guide blocks that come with the AltMillâs gantry system. there may be more than 7.
UH OH. Those guide blocks came off a couple of times when flipping the table. I may have a problem.
The way mine arrived at least you had to unwrap it in order to get the cross beams out. They were all wrapped together not separately.
I did not notice the guide blocks moving freely when assembling mine so just wonder how they could have fallen off?
Yes. You have to unwrap. They didnât so much âfall offâ as it was more like they slid off when tipping the table over.
My Z sensor showed up yesterday. So I was finally able to surface my spoilboard. Everything seemed good, so⌠What do you do when your computer keeps disconnecting? Forcing the job to stop. Can you just start it right where it stopped? I had that happen 3 times while surfacing.
Do you have a non-Sienci VFD spindle? I had a ton of EMI noise when my spindle started, but after swapping out the wiring between VFD and spindle with purpose-built and shielded wiring all m problems went away. A good USB cable (assuming you are using USB between PC and SLB-EXT) also helps, especially with a ferrite bead.
So I was sliding by mine during assembly, it was tight. The slider bearing decided to hold on to my cloths and off the rail it went. Iâm still finding tiny bearings on the floor.
One thing I like about this machine, is I just looked up the bearing in the opensource docs and ordered a new one. HGH15CA Linear Slider Bearing Blocks 2Pcs,15mm HG15 Linear Motion Ball Bearing Carriage Slider Sliding CA Block for Square Linear Slide Guide Guideway Rail HGH15 HGR15 as CNC Kit Part Replacement: Amazon.com: Industrial & Scientific
When it comes time to oil them, Iâm planning on replacing them with the self oiling bearings.
Recirculating ball bearings can be made with extremely tight tolerances. Have you researched what kind of tolerances you can get with self lubricating (presumably non ball) bearings?
I always thought that there was a reason why the standard in precise linear bearings were recirculating ball bearings.
Same with mine, when I flipped the table 2 of my linear guides dropped off but I lucked out and no scatter occurred.