|John MC||13/03/2018 12:36:10|
68 forum posts
Many years ago I acquired a large quantity of 8BA screws, cheese and hex. head and varying lengths, probably a life times supply. As might be expected, they are never the right length! So I take the next longest, screw on a nut, cut it to length, then touch it on a fine grinding wheel to tidy up. This is fine when only a few need shortening but tedious for the 50+ I need for my next project.
Any ideas to make the job easier?
|Ian Parkin||13/03/2018 12:55:01|
512 forum posts
I have a set of pliers side cutters and they have screw cutting holes for m3.5 and m4 near the joint they work great if your screw fits in the holes
Shortest length is perhaps 8mm
|Mike Clarke||13/03/2018 13:19:35|
74 forum posts
I shorten screws/bolts with a "nut plate". Just a random bit of MS plate, drilled and tapped to suit screw. You can set required length with washers or spacers under head of screw. Cut off the excess with a hacksaw and then file flush with nut plate.
645 forum posts
Plus 1 for Mike Clarkes' method. When you've finished just store them away for future reuse.
|Matt Harrington||13/03/2018 13:41:18|
69 forum posts
I use simple jig.
This one is a little better and easy to make on the lathe:
|Martin Kyte||13/03/2018 13:48:06|
|1238 forum posts|
If you use a piercing saw the grinding op is not needed so that speeds things up a little.
|1470 forum posts|
I’ve made up some little threaded (M3, M4, M5, M6) jigs to trim down screws on the lathe. They screw in from the back and I then run the lathe in reverse to trim the screws.
430 forum posts
One of these will crop them off square, **LINK** just a burr to clean off.
Sorry I couldn't find a UK pic
|Speedy Builder5||13/03/2018 15:01:48|
|1379 forum posts|
Same question - different answers.
|Michael Cox 1||13/03/2018 16:23:15|
|470 forum posts|
Here are a couple of good methods from Rick Sparber:
He also has a simple jig for bevelling the ends of cut bolts:
|Russell Eberhardt||13/03/2018 16:42:39|
2176 forum posts
I use a lantern chuck and a fine parting tool.
|Tractor man||13/03/2018 17:47:53|
|405 forum posts|
|I saw a design for a lantern chuck in M.E. I think. |
Trying to think of a way to do batches of five or ten at a time but it involves making jigs etc.
|John MC||14/03/2018 08:37:57|
68 forum posts
Many thanks for the replies. The root of the problem is not cutting the screw to length but tiding up the cut end so it will screw in to the mating thread. I like the ides of the of a "nut plate" as that will hold the screw while being cut and the end tidied up, unscrewing it through the plate will restore the thread.
Off to the workshop to make a nut plate.
|Alan Wood 4||14/03/2018 09:41:35|
|99 forum posts|
|Matt Harrington||14/03/2018 09:55:33|
69 forum posts
Thanks for posting Alan, I like simple approaches and the brass collars are just that.
1799 forum posts
|Fowlers Fury||14/03/2018 12:02:16|
176 forum posts
Re: " The root of the problem is not cutting the screw to length but tiding up the cut end so it will screw in to the mating thread"
Addendum: Presumably the similar concave-shaped, but aluminium oxide stones which are freely available for mini-drills would be as effective although not as long lasting.
Edited By Fowlers Fury on 14/03/2018 12:27:24
|Rob Rimmer||14/03/2018 15:07:17|
|22 forum posts|
I like the idea of that diamond grinding cup, so a quick search found **LINK**
Not found anything in the UK yet, but they seem to be a fairly common jeweller's tool so will keep looking.
|Fowlers Fury||14/03/2018 15:28:48|
176 forum posts
".......so a quick search found......"
Rob., well found !
Prompted by your reference to a "jeweller's tool" - I'll also start searching.
|Steve Crow||15/03/2018 13:40:08|
|37 forum posts|
I made a primitive lantern chuck for small screws. The collets are for 12BA and M1.6.
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