Knobby knife

[swazi_matt]

Anyone got a knobby knife taking up space in their workshop? Keen to try it out but not keen on the premium price :-)

Have a wife, two children and a weakening currency that is really eating into my fun factor budget! (On the off chance my wife reads this I will not go into specifics)

[Elvis74]

I use a chisel and Heat it up with a Flame, Wirkens pretty good.

[rgranger]

I have used mine a few times, works ok. Not sure that it is heating up as well as it did before. I would think that you may be able to add 50% to the life of a tire. if you go though a lot that adds up fast.

[GMP]

The trick is not to take too big a bite, if you do, it's harder to cut and seems like its not hot enough. Don't try to remove the entire radius of the dull edge, just take a very thin sliver. Also carefully note the angle of the knob and follow this when cutting, don't plunge it straight down. Done this way it works well.


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[swazi_matt]

But none of you looking to free up space in your workshop? Ps shipping would be to Michigan

Elvis the electric knobby knife seems to be a lot of effort, I think I would rather have my kids go barefoot before I use your method . At the moment, when the knobs get short I just put a cut across the centre of the knobs with a carpet knife just to add flex to the knobs

[nknudsen]

Is the purpose of this to remove the rounded front edge of the knob? Do you cut the front face off the knob to sharpen the knob?

[GMP]

Yes, exactly

[nknudsen]

If your in a bind, what about a hand held grinder with a course sanding disc? It'll be messy but will work. I finished the edges of two snow flaps I cut out for my Ski-Doo Alpine project this way. The edges turned out real nice.

[GMP]

I've done that in an emergency when I could not get a new tire for my son's bike. What a smokey mess! Didn't even realize how bad it was because I was focused on the job but it really stunk up the house and pissed off my wife! Not that accurate either. Better using a blade for a wood plane or something like that in a pair of vise grips and a MAPP torch. I've also used a hacksaw with the blade ground like a knife (no teeth). That worked fairly well but taks a lot more muscle.

[swazi_matt]

Well it looks like my kids are going barefoot, but thanks for the suggestions, I may use one of the methods listed to cut the toes off their shoes when their feet get too long!