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Sure, everything about engineering is about compromises. Anysort of machining/grinding that hits the same tolerances as an epoxy bed is going to be an order of magnitude more expensive. (Unless you...

Because a better way would be much more expensive. Yes, ideally we would all be mounting our rails on nice machined, stress relieved and ground cast iron frames. But each one of those operations on...

Precision Epoxy's SC-15P is steel casting epoxy designed for linear rails. As long as you use a thin (1/4" or so) layer of epoxy to mount your rails to, the stiffness of the epoxy (or lack there...

If you think you can make a better sender than bCNC, I think the community would be excited to see it. In my opinion bCNC is the best sender out there right now, and its certainly far from perfect....

Rather than starting from scratch, why not just fork bcnc? It's already a great sender, and would be alot easier to modify rather than having to write everything from scratch.

Precision Epoxy claims a level criteria of 0.001" , although they don't give a length for that. Their steel casting epoxies have a much higher stiffness than just a pure epoxy. Regardless of the...

What is the wall thickness on the tubes? I'd say you're better off with 1x120mm as it'll be stiffer horizontally which is the direction you'll most frequently be loading. Plus it'd be alot less...

Sadly, most of the foundries in the US have dissapeared. The building I used to work actually was originally a foundry making single castings that were over 50 tons. Its generally too expensive too...

Assuming you use enough bolts that are large enough, its fine.


The problem with getting components from a random vendor on aliexpress is you don't really know what you are gonna get. It may be...

7075 isn't any stiffer than 6061 or any other AL so it'd be a waste to use a more expensive alloy. You're going to have forces and moments going in all three directions as you machine so you need...

I would move your spindle mount to the bottom of the plate. Having the plate stick out below does nothing for you but get in the way.

Also looks like your design could use some more lateral...

First you need to address the working holding. A piece that is moving around is going to be a disaster regardless of your speeds and feeds. You could try using CA glue and blue tape, or use...

You could have them drill a bunch of large holes in the base to lighten it without effecting the cost much. They're probably very used to drilling holes for faucets and such and thus wouldn't charge...

I would certainly go thicker with the granite base. 10mm more on the thickness almost doubles your bending stiffness. Flat plates like that are very poor in bending so making it thicker is hugely...

Ahh thank you sir, Apologies I hadn't read the whole thread and missed that.

Nice, do you happen to have any pictures of the CAD or the actual parts? How did you attach the scissors to the cover?

Those way covers do look awesome. Is there a cross brace or anything underneath them to keep them aligned or do they just float on each other?

As I said before, The epoxy layer is thin enough the stiffness doesn't really matter. If 4Gpa is fine, 18 will be even better.





I was hoping the supplier would have some creep rate data,...

I know we all like to do lots of analysis to figure out the optimal parts and design, but in reality unless your budget is such that you can just go to Rexroth or whoever and spec something out,...

Have you considered how much all of this is going to weigh? And how much all of that steel is going to cost?

You've got an awful lot of steel (and therefore dollars) just holding the machine up. ...

What are you going to use it for? How are you attaching it? How do you plan on assembling it? Each red tube is going to weigh more than you can lift.

Without knowing much it looks like you have...

Which software was this on?

Shortly after Altair bought Simsolid they tried to push us towards it and I spent quite a bit of time evaluating it. If you just want a pretty picture, its great (which to be fair is we are mostly...

I'm not suggesting doing the math by hand, obviously use Excel or Mathcad or the like. Keep in mind that every aircraft you've ever been on was analyzed primarily with hand calculations (Note, again...

I threw together a FEM of a section of rail to study how a moment on the linear rail trucks would deform the epoxy under the rail. It's a non-linear FEM, with the fasteners modeled using solid...

Ideally yeah, I'd just mount them directly to the steel tubes. But I'd need to either machine them in multiple steps on my Bridgeport (as they are too long to do in a single setup) and hope I'm able...

There are alot of better FEA packages than Solidworks, but they all cost alot more. Abaqus and Patran are my favorites. Unfortunately Autodesk removed the simulation module from the free version...

Before jumping into FEA, its a good idea to learn to do the analysis by hand. Frequently for these simple structures its actually alot easier (and cheaper) to do using mechanics of materials type...

The E6 servos apparently work with Servostudio. I assume the servo drives are actually made by Servotronix. The software looks pretty dated, but for the price I might roll the dice on one.

Its...

Commander is closed source and Windows only. Its also pretty far behind the other gcode senders for GRBL. No live position view, the 3D view's performance is terrible, and it only runs at a fixed...