Any thoughts on this design for a gantry setup?

[Dwayne Dibbley]

http://www.ebay.com/itm/CNC-Router-K.../261751815691?

Thanks

[EddyCurrent]

You have to keep in mind that manufacturers at this level want something they can build quickly, easily, cheaply. My opinion is that the cross beams making up the gantry are not deep enough in the Z direction. If they were the same width but 3 times deeper then okay. Also the side plates would need to be 20mm thick.

[Dwayne Dibbley]

You have to keep in mind that manufacturers at this level want something they can build quickly, easily, cheaply. My opinion is that the cross beams making up the gantry are not deep enough in the Z direction. If they were the same width but 3 times deeper then okay. Also the side plates would need to be 20mm thick.

something like this? Original on left, 3x on the right.

[EddyCurrent]

@Lee, No I didn't fully read it but what's the learning point ?

@Dwayne Dibbley, yes, the one on the right looks better to me, also you might have one cross beam as you've drawn it but the other like the original, that way it's more rigid in both directions.
Hopefully more people with mechanical background will give their opinion.

[crazydiamond]

Not crazy about the single bearing on the y axis.. Also I'm always suspicious of non-branded rails (didn't see any mention of the brand in the description). Spk64 over on CNCZone found a supplier of profile rails and bearings on aliexpress (Three Ring Precision Machinery) for dirt cheap. He ordered them and ran some tests.. Basically they're not hardened to the same specs as the big name brands (THK, NSK etc) and will surely fail much sooner. Funnily enough they're fully compatible/interchangeable with the THK HSR line (basically a complete copy, but to a lower spec)... Not saying it won't work well for hobby use, but just something to consider.

Devin

[EddyCurrent]

Not crazy about the single bearing on the y axis..

I think you mean sigle ball screw, also while I understand on your side of the pond that would be the Y axis, on this side it's the X axis, no big deal with that just mentioned it to prevent any confusion.

[Lee Roberts]

Have you read the description for that listing Eddy?

.Me