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My Tubing Bender
djc:
--- Quote from: snub on June 15, 2011, 12:06:52 AM ---As you can see below, at 90˚ I have run out of follow block. The only insight I had into the length I should make it was from DiAcro, which said the length of the follow block should be 3 1/2 times the radius of the roller for a 180˚ bend.
--- End quote ---
Technically, that is correct. When you do a 180 degree bend, you are going half of the circumference of the grooved roller i.e. pi x R. However, for it to work in practice with exactly this length, the end of the follow block would have to start directly opposite the bearing centre and it would finish similarly. If you want to start the follower with its end flush with the machine's frame and have it end this way, you need to add the frame width to the 3 1/2 R dimension.
I wonder if you should replace the dead end clamping screws with studs and wing nuts, one with a spring under it and slot the top cover on the other one. Enables quick-release and is more long-term durable than screwing into and out of aluminium.
John Stevenson:
I'm more intrigued by the square headed countersink screws in the third picture?
John S.
Bluechip:
JS
Never seen machine screws with square socket drive, but 'coach-bolty' things, yes.
Slung a lot out about 3 years ago. Only square drive key I had was 1/4" AF, the ones I had were 5/16" drive, or maybe 8mm ??
linky ...
http://www.squarescrews.co.uk/
Not that I suppose mine were from there.
Dave BC
Blade:
Nice work, looks like it functions well and makes a great bend.
No1_sonuk:
--- Quote from: John Stevenson on June 16, 2011, 04:48:04 AM ---I'm more intrigued by the square headed countersink screws in the third picture?
--- End quote ---
They're "Robertson" drives. Popular in Canada.
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