[TheForge] bolt thread repair tool

[Peter Fels & Phoebe Palmer]

Bruce:
The old time thread dressing files have 4 properly spaced teeth per row with rows of each size over 1/2 the length of the 4 sided tool. So 1 or 2 teeth track in the good threads to guide the other 2 or 3 teeth in recutting threads. For example…

http://www.amazon.com/Nicholson-Thread-Repair-Single-Square/dp/B001T4KRHC

With that and a collection of thread dies i can usually get by.
It’s faster and more accurate than a triangular file, though the picture of you trying to hold the file in place as the bent bolt wiggles around in the lathe is amusing.
With an inexpensive hydraulic jack in a rigid frame, and 3 pieces of brass or copper on the pressure points,
bent bolts are easily straightened without trashing the remaining threads, usually.

On Feb 22, 2015, at 4:08 PM, Bruce . <freemab222 at gmail.com> wrote:

Well, two reasons.  Because you can.  And because filing threads can be a
drag.

The post vise bolt I fixed with a triangular file was bent and miserable.
I tried chucking it into the lathe, but it was far too bent for that.  I
did spin it slowly in the lathe while using the triangular file -- that
worked nicely.



Bruce
NJ

On Sun, Feb 22, 2015 at 5:45 PM, Peter Fels & Phoebe Palmer <
artgawk at thegrid.net> wrote:

> I can imagine that if you have an extra tubing cutter, you could regrind
> the axle so as you rotate it it would conform to different thread pitches,
> and you could regrind the blade to the 60*(?) thread angle required,
> though it doesn’t resolve parallel tracking problems entirely.
> But why?
> 
> On Feb 22, 2015, at 8:30 AM, Bruce . <freemab222 at gmail.com> wrote:
> 
> I wonder whether a tubing cutter or pipe cutter would do the same.  Might
> have to re-mount the cutting roller on a smaller pin so it can rotate
> slightly off-axis.  I'll have to give it a try.
> 
> I don't have much use for it, but I did have to clean up the pivot bolt on
> an old leg vise a few months ago and it might have come in handy for that.
> I used a triangular file, which worked.
> 
> Bruce
> NJ
> 
> On Sun, Feb 22, 2015 at 11:02 AM, Rob Fertner <rfertner at cox.net> wrote:
> 
>> 
>> I've mentioned this website before. They've recently posted about a tool
>> that may save the threads on a bolt. This may come in handy with old
> stuff
>> you're repairing and you don't want modern looking bolts to spoil the
> look.
>> 
>> http://toolguyd.com/threadmate-tools-repair-just-about-any-threads/
>> 
>> Rob
>> Wichita, KS
>> 
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