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I'm a bit of a beginner at this but if you want to model this, I think you want to use contact mechanics... in particular,...

Hey all,

I have a small pile of inexpensive THK MTF0802 ball screws. These guys have maybe 50 microns of axial play that I want to take out. Is it reasonable to use a coil spring to take it out? I...

Hey everyone,

I have a quarter inch shaft that's 6 inches long that must be free to rotate around its axle but needs to be completely spatially constrained otherwise. It can not have more than 2...

Hey all. I'm designing a machine for a very specific kind of coil with a special wind. I've settled on a mechanism which depends on a shaft which is free to rotate (only about 10-20 degrees... it...

Does anyone know of a good reference for how to design the sorts of linear rail systems you find in printers and cd-rom drives? I'm looking for something simple and cheap to manufacture, but is still...

What are linear roller slides?

Called sodick. They said crossed roller slides were chosen for longer machine life (rollers contact over a very large area in comparison to ball bearings) and to a lesser extent, lowered pulsation...

Why is it that super high end machines like sodick mills use crossed roller guides in lieu of SHS or HSR linear bearings? What makes them better? If I were to build my own machine, what do I need to...

I'm working on a small epoxy granite machine for making molds for small planetary gearboxes and for directly milling microwave waveguides in naval brass. The end machine I want to hold tenths over 6...

So, my background is in embedded kernel work... specifically on ARM. I might be willing to hack on RTAI for ARM if I could trade my time for motion control hardware. Boards, servos, or most...

please delete

Another belt won't work obviously because the thing isn't constrained and will just bounce and since this is an optical system, it'll lose focus. I can't use two screws because one of the original...

Well, linear bearings certainly don't have particularly low friction in my experience, in comparison to metal on teflon or metal on delrin. They certainly seem to take load quite well, but you're...

I see no reason to use linear bearings since there's little to no load, haha.

I'm trying to come up with a flying optics system for a laser plotter. I'm going to be using very narrow timing belt to drag the carriage back and forth, but I'm not sure what to have the carriage...

Yeah, the figure I'm looking for is rotational stiffness... instead they have the static permissible moment... which is like, how much can you torque this thing before it just flat out breaks.

I did out the math and it's maybe 250 pounds I can put on tip of the longest tool I'll put in the spindle while still being alright. Figure a safety factor of 2 or 3 even and I'll break any tool I'll...

I saw a certain CNC milling machine that seemed pretty well engineered, except for one feature... they appeared to be using one truck per rail, and two rails total for the Z axis. The compromise made...

I guess I can redesign the part for somewhat looser tolerances... I'm more interested in what's involved in actually grinding this with stuff I could bolt onto my lathe or mill.

I have a benchtop CNC... I figured maybe I could throw a cup wheel on it. It's usually repeatable to +/- 0.001, which is why I figured this was reasonable in carbide.

I've got half a day to throw...

Is there any information out there about how to make end mills out of drill rod? Specifically, I'm really not sure how to relieve the cutting edge for a quarter rounding cutter. The radius has to be...

Taig or Sherline with a Sherline rotary table, and kool-mist for coolant. I wonder if you'd be able to get away with a vortex tube for cooling... but kool-mist is a safe bet.

Ball screws for machines in that price range are likely to be rolled and not ground, and thus not much better than lead screws. Even the townlabs website admits up to 0.003" backlash for ballscrews...

I'm using shinetsu ke-1310st addition cure silicone and innovative elastomers ie-3075 urethane elastomer. I degas the urethane under 29.9 inhg in a polyethylene cup until it stops bubbling (minus the...

My girlfriend found some vacuum pumps in the junk pile at the biotech company she works at, and I really need a good way to hold down circuit boards and thin metal things. Has anyone built a vacuum...

I've seen several people replace their spindles with AXI outrunner motors, but haven't been able to find much information on what materials they were cutting afterwards. I'd like to not lose my...

You're not listening.

What you're suggesting is like putting a jet engine in a scooter. No, you aren't going to be able to beef up that scooter enough such that it can accept a jet engine. Yes you...

So, I was told as a rule of thumb, never go more than a diameter and a half deep into the material. Is there any time when you can break this? I have to machine a little aluminum piece to about 1/8th...

I'd like to make some very deep but narrow cuts in a thick plate of 6061 (somewhere between 0.25 inch to 1 inches). Is there any reference to how narrow an endmill you can use for a given DOC? I've...

I homebrewed a servo system and have some linear rails lying around... I'm sure it'll be cheaper to just build my own system around a rofin sinar/synrad/coherent laser. What should I expect to...