The linear bearing were a hangup for me, all the best ideas were either expensive (v-groove bearings, 1/2"+ linear bearings), or looked flimsy for my application (8mm linear bearings).
I've seen this design on the internet before, and couldn't come up with a better solution that didn't cost a small fortune.
I will weld 1 1/2" angle to the backs to make mounting brackets.
- 1" angle iron cut to 4"
- Holes drilled at 1/2" and 1 1/8" in from each end (roughly)
- Clamped to a jig to ensure holes are perfectly aligned in relation to the center
- Each bearing has a 1/4" washer on each end of the 608zz bearing, a 5/16"x1" bolt and 2 nuts (one on each side of the angle iron)
With the bearing design done I started the X-axis
I wanted a bigger work area that the RepRap's 8"x8"x5.5" My X-axis has 11 3/4" max travel. I was going for 12", but the frame interferes. I'll probably limit it to 11-11 1/2". the Y-axis should be about the same, haven't decided on the Z axis yet, I have 8" in mind, but probably between 6-10"
- Slides are 16" long, allowing 12" travel (without the cross pieces). the slides are structural frame parts. they have 1 1/2 angle iron welded to the back of each end to attach them to the cross pieces
- Cross pieces are 18" wide, allowing slides to be bolted at 15 3/4" wide. It will work out to 16" when I do the Y axis mounts (1/8 added per side)
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