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-   -   Help: Need to cut lock (http://www.bikeforums.net/general-cycling-discussion/625207-help-need-cut-lock.html)

cervelo48 03-01-10 05:50 AM

Help: Need to cut lock
 
I have a 150cm Fahgettaboudit chain that I'd like to cut to make two smaller chains.

I have a jigsaw and a power drill. Can I get through the links with a metal jigsaw blade or do I need some sort of disc to install on my power drill? If so, what kind of disc would be most economic for this type of job?

Cheers,
-P

Timber_8 03-01-10 06:19 AM

I would use the jigsaw with a metal cutting carbide blade. Don't skimp on the blade, buy a Lenox 3 or 5 pack. If the chain is hardened steal it will take a few blades. Keep the blade cool with water or cutting oil only, don't use penetrating or any other oil, it will just burn the blade. Bolt cutters would be best & your drill would work but it doesn't really have the RPMs

onbike 1939 03-01-10 07:36 AM

An angle grinder is more suited for this job.

Timber_8 03-01-10 08:51 AM

I think all he has is a drill or a jigsaw to work with

carbondated 03-01-10 09:02 AM

A jigsaw with a carbide blade won't do much on case hardened steel. If it scratches it it will just seize the blade at any depth, too flexy a setup to cut that.

You will have better luck with a cutting disk on your power drill, buy two, channel your cut to be wider than the disk. If your drill is low rpms it will just take longer.

Bolt cutters that can cut that chain are 6 foot long, I guess you could use smaller ones with cheater bars but you still need to be able to put several hundred pounds or pressure at the handle end of the cutters and be able to brace against the ground.

AdamDZ 03-01-10 09:10 AM

Liquid hydrogen, chisel and a hammer? ;)

A.

Booger1 03-01-10 01:53 PM

Radiac wheel for your drill.

JohnDThompson 03-01-10 02:16 PM

This works every time:
http://www.tpub.com/content/construc...14250_83_1.jpg

DallasSoxFan 03-01-10 02:42 PM

Buy a simple steel hacksaw and a good blade. Either of your power tools will piss you off trying to get them to work right.

Cyclaholic 03-01-10 04:07 PM

Quote:

Originally Posted by cervelo48 (Post 10464694)
I have a 150cm Fahgettaboudit chain that I'd like to cut to make two smaller chains.

I have a jigsaw and a power drill. Can I get through the links with a metal jigsaw blade or do I need some sort of disc to install on my power drill? If so, what kind of disc would be most economic for this type of job?

Cheers,
-P

I hope you're in no hurry!

Seriously, just take it down to your local body shop and they can gas axe it in 20 seconds.

doctor j 03-01-10 04:18 PM

I've cut through the shackle on a couple Master padlocks with a Dremel tool and one of the small cutoff wheels that comes with it. I had to cut them because I had lost my keys and didn't have much of a choice. It takes a light touch and some patience. I broke a few cutoff wheels before I got the hang of it.

Timber_8 03-01-10 05:39 PM

A pair of 24" HK Porter bolt cutters with cut a 3/8 hardened bolt or just take the chain to a hardware store and have them cut it for you.

Sixty Fiver 03-01-10 05:44 PM

cervelo - This would be an excellent opportunity to test the chain for resistance to different cutting methods.

I'd start with a hacksaw and move up to 24 inch bolt cutters (good luck with those), try longer bolt cutters, and then if that fails use a cut off wheel or a torch.

If the 24 inch bolt cutters can get through that chain it isn't worth the money you paid for it... a common strategy for thieves is to take 24 inch bolt cutters and a few lengths of pipe to serve as extensions to get better leverage.

Timber_8 03-02-10 02:41 AM

1 Attachment(s)
I use 24 inch bolt cutters to cut hardened seals off overseas containers all the time. HK Porters are the only bolt cutters I would ever buy. Locks and chains only remove temptation. If someone really wants it there isn't much you can do about it. Cable is the hardest thing to cut threw & a large diameter Ulock. Stock over a 1/2 inch you can't get into the jaws of bolt cutters

wolfchild 03-02-10 04:35 AM

If I was a bicycle thief the first place I would visit is Bikeforums, lot's of good info on cutting and breaking highsecurity locks.

Artkansas 03-02-10 04:22 PM

Quote:

Originally Posted by wolfchild (Post 10469288)
If I was a bicycle thief the first place I would visit is Bikeforums, lot's of good info on cutting and breaking highsecurity locks.

I was just going to say something similar.

I did look at the O.P.s other posts, and it looks like he is legit. However, we don't know about guests who might be reading this page.

clasher 03-02-10 04:35 PM

If you're savvy enough to be searching through a forum to find cutting advice, you can likely do it just as easily on google.


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