A lucky find, a good machine?

[Jason Marsha]

Post some pics of the actual part you are having trouble with.

Jason

[ViperTX]

TimKoene....you'll need to select the piece of wood carefully....when wood cracks like that it is either dry or the grain is running in the wrong direction.....if you can't find a piece of wood that is quartersawn, you might make the mounts from some type of plastic...lexan, delrin, or if you have some phenolic board....you would also epoxy some PC board material FR4 into the size you need and use that like you would the wood mount.....

[TimKoene]

Hmm, I only have access to wood for the moment. Wood and angle iron/alu. Here in holland acquiring blocks of plastic is very difficult.

I have attached a poor drawing of the wooden jig I want to use to mount the nut. The nut attaches to the face of this plate with the 4 mounting holes. Then the mounting bracket is attached with allthread through the length of the wood. I made this of two identical pieces of 22mm (~little less than one inch thick)MDF. The tightening of the nuts pulling the bracket to the table will make cracks appear in the side of the bracket rendering it useless.

Any ideas?

[ViperTX]

Okay, maybe where or how it mounts to the mating surface is not flat.

Here's a solution, ...make the bracket but radius the inner corners, also another solutions that causes some headaches during assembly....make the bracket square or rectangular then bore out a hole in the center where the ballscrew nut will mount.....it's like having a rectangular/square donut.

[lucas]

You could make the plates wider and bolt the MDF together before you tighten the allthread so that it can't split anymore. Also using a big washer on the allthread will spread the force.
Angle iron would be better but it looks like you won't be able to find a large enough size in normal shops to mount the nut directly, you could however use 40x40x3mm angle (readily available in hardware shops) and use 2 pieces of these to fix the MDF to the table, one on the front another on the rear.

[TimKoene]

Hell no this thread ain't dead
I finally got a chance to make some good couplings between nut and table. Made them out of 1" thick PVC block I found. Works a charm!
I have been able to complete my first axis! The Y-axis is the one on the gantry and I managed to make it magically move all by itself. Does anyone have video encoding software, because the only video I have is 20mb for a 1 minute sequence. Crappy camera codec.

you can find it here: http://timkoene.4hv.org/test/y-axis.avi

Greetings,

Tim