The Shop > Wood & Stuff
Banjo Build
vtsteam:
How about a belt to the outside of the banjo, since you've got that round? a vee belt will work on that much wood surface area without need for a vee. A small rod in wood bearings for an arbor (jackshaft) and a small vee-belt pulley between them at the other end. A couple of machinery bushings (stop collars) on the arbor to trap it. Chuck the arbor end. That takes the side load off the drill/motor.
S. Heslop:
--- Quote from: krv3000 on May 03, 2015, 06:27:22 AM ---Hi I like the switch mod
--- End quote ---
Me too, shame it didn't work!
--- Quote from: vtsteam on May 03, 2015, 08:18:13 AM ---How about a belt to the outside of the banjo, since you've got that round? a vee belt will work on that much wood surface area without need for a vee. A small rod in wood bearings for an arbor (jackshaft) and a small vee-belt pulley between them at the other end. A couple of machinery bushings (stop collars) on the arbor to trap it. Chuck the arbor end. That takes the side load off the drill/motor.
--- End quote ---
The outside isn't really round yet. I was going to try cutting the outside first, but decided it'd probably be better to try get the thing more balanced by cutting the inside first. Plus it'd get in the way when I eventually get around to cutting the outside. I did consider a jack shaft to reduce the rpm but that was starting to get complicated.
I ended up pinching the speed controller from the jigsaw. If it doesn't catch fire I shouldn't have any trouble putting it back when i'm finished. The drill still has runaway speed, but it's much more adjustable than just with the trigger, so i'm able to fiddle with it and the speed of cut so that it maintains a steady and slower speed when working.
Using the battery drill to control the cut. Much easier than the crank and it doesn't sway the slide like when cranking it.
Managing a fairly heavy cut, about 3-4mm.
It's leaving a fairly okay cut. Bit hairy on where its cutting into the endgrain but it isn't tearing chunks out and its nothing a bit of sanding can't clean up.
Had a bit of a weird day today and didn't get alot done. I probably could've cut more but at the time I was thinking I might regrind the tool to reach all the way to the end. But I just realised that I probably wont need to cut it all the way since it can be cleaned up with one of those flush cutting router bits.
Also, just for the record, i'm switching the thing off when fiddling with the speed controller since it's all very exposed. If it was a more permanent setup i'd have built an enclosure for it.
S. Heslop:
Damn thing seized up, then the nut the threaded rod was working against started spinning. Took it apart to see what the problem was.
That's alot of filings for just moving the thing in and out about 15 times. The nut was really fused onto the bar and I couldn't get it off with it in the vise. My guess is either that the filings built up and clogged the nut, or the nut wore so much that what was left of the threads swaged into each other.
I'm just going to try the same thing again but with some grease and see how that works.
S. Heslop:
Tried John Mill's thing of squashing a nut into aluminium, but M8 was too much for my vise and it broke the screw. The screw had already broken at the tip and really I sort of anticipated this'd eventually happen, but i've been abusing the hell out of that vise since i've got a nicer one to replace it with. Problem with the nicer vise though is that I won't be able to abuse it so freely.
Plenty of grease. I'd expect the grease to just swell the wood, but with the layer of wax and not expecting this thing to last for long anyways I thought i'd try it.
But...
Inspecting the damage, it doesn't seem that the the tool moved in the toolpost as I'd imagined would happen, but the whole thing must've moved.
To be fair, before this happened the tool was digging in a fair bit. It was making unpleasant sounds, but I sort of just wanted to get the thing more or less to size. I think it was mostly the tool geometry at fault. I was being lazy in not wanting to regrind it into something more suitable. Although it's not a wholly rigid setup to begin with.
Shouldn't be a hassle to glue it back on at least.
Will_D:
Simon,
I really admire your ability to take some pieces of plywood and build machine tools that work.
And boy do you test them to the limit!
Keep safe and keep up the good work
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version