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Old 4 Weeks Ago   #1
coachgeo
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Default Does a Die work backward

As in Tap and Die...... not rising one from the dead.

as in if one has a bolt to shorten (sawzall) and sometimes that buggers threads on the end.... what if you put the correct die on it first..... cut off bolt to size..... then ran the die off backward to clean up the thread. Would keep all the threads lined up that way.
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Old 4 Weeks Ago   #2
nbryan
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Default Re: Does a Die work backward

Should work but suggest putting on the die bit backwards so the cutting side faces the cut end when removing.

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Old 4 Weeks Ago   #3
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Default Re: Does a Die work backward

Actually a good idea I may use sometime. Thanks!

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Old 4 Weeks Ago   #4
Lil Foot

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Default Re: Does a Die work backward

That will work, but if I need to do that, I just run the die on backwards first, then it has the cutting edges in the right direction as you run the die off the cut off end of the bolt. And of course use a file or grinder to chamfer the cut off end before running the die off.
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Old 4 Weeks Ago   #5
bcp
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Default Re: Does a Die work backward

I just use a nut, not a die. It has always worked.

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Old 4 Weeks Ago   #6
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Default Re: Does a Die work backward

Quote:
Originally Posted by bcp View Post
I just use a nut, not a die. It has always worked.

Bruce
X2 in that.
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Old 4 Weeks Ago   #7
Lil Foot

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Default Re: Does a Die work backward

Quote:
Originally Posted by bcp View Post
I just use a nut, not a die. It has always worked.
Bruce
Usually does, just a matter of how much the threads get distorted in the cut process.
Hacksaw, nut works great; abrasive cutoff saw, a little less great; chopped with a bolt cutter, not so much.
Bolt (or all thread) material has a lot to do with it also. Hard, quality material usually cuts cleaner and with less distortion than cheap, soft, gummy material.
Of course, a metal lathe works pretty well also.
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Old 4 Weeks Ago   #8
bird dogger

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Default Re: Does a Die work backward

Quote:
Originally Posted by coachgeo View Post
As in Tap and Die...... not rising one from the dead.

what if you put the correct die on it first..... cut off bolt to size..... then ran the die off backward to clean up the thread. Would keep all the threads lined up that way.
Running a die backwards does work but the die's teeth are much more susceptible to chipping or breaking. Maybe not so much in your application unless the cut really buggers up the end threads. As mentioned, spinning on a nut first works most times. You can also use "thread chasers" meant to clean up threads that have become dinged, etc.

One simple way that works well is to spin on a sacrificial nut first. Then cut your bolt. Follow that up by running the cut end with the nut against a belt sander to sand the bolt's threads smooth against the nut. After removing the nut you can lightly touch up/bevel the cut edge with the belt sander or a file.
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Old 4 Weeks Ago   #9
chim
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Default Re: Does a Die work backward

As mentioned, running a nut on first works fine. It depends on the size of the threaded bolt/allthread and the application. At work we cut thousands of pieces of 1/4" through 1/2" allthread on bandsaws for conduit and pipe hangers and do nothing. Larger diameter threads tend to not be as fussy.

Most electricians have cutters for #6 thru #10 machine screws something like this:

https://www.amazon.com/VISE-GRIP-Stripping-Cutter-8-Inch-2078309/dp/B000JNNWQ2/ref=asc_df_B000JNNWQ2/?tag=bingshoppinga-20&linkCode=df0&hvadid={creative}&hvpos={adpositio n}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt= e&hvdev=c&hvdvcmdl={devicemodel}&hvlocint=&hvlocph y=&hvtargid=pla-4584276296708160&psc=1

For some applications where the item will be disassembled and reassembled, I'll cut with whatever tool is handy and grind a bevel on the end to get a nice starter thread and get rid of sharp edges. Best grind in the direction from the outside towards center so the material being ground away doesn't deform the threads.
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Old 4 Weeks Ago   #10
Tughill Tom
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Default Re: Does a Die work backward

Just use a nut and a bit of oil to help clean out any burrs. Maybe touch the bolt up with file. Save the Die for cutting as designed.
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