Thursday, September 04, 2008
Repstrap and CNC progress update
I haven't posted much, but not for lack of work. I've been busy working on a repstrap / CNC router design that's buildable for a low cost (< $200 including all tools and materials) from parts available in your local hardware store, with minimal or no tools.
It's been slow going, but a recent prototype linear bearing assembly has shown promise. It's my first to come close to meeting those criteria - inexpensive, no tools required, and all parts available at the local Home Depot. It's built using 1/2" internal diameter black pipe and fittings, 5/16th allthread rod and nuts, skate bearings, and double-eye-hook contraption I don't know the name of. :) The eye-hooks are used to tension the allthread rods, rotating the black pipe floor-mounting flanges and trapping the guide rail between the sets of skate bearings.
Total parts cost for this assembly at the local hardware store was about $15 US.
Now that I have a linear bearing that works, I hope to quickly move on to an entire repstrap capable of being assembled without so much as a single power tool.
There are a pair of skate bearings on each bolt.
Two bolts per flange.
The flanges are rotated to force the bearings against the running pipe/rail
The rotated flanges are held in rotated position using what looks like a turn buckle (Wire tensioner)
I never would have thought of that one.
If you move your turn buckle to the side of the flange away from the rail/pipe it has no chance then of catching anything.
Don't know whether this is of any use to you. Thought it might help.
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