Where can I find fine tooth hole saws?

[Phil Meisner Jr.]

Can anyone tell me where I can find fine tooth hole saws? I have a JD Squared Inc Notch Master tubing notcher that works fine but the Morse Master Cobalt bi-metal hole saws that I got from Van Sant keep breaking the teeth off. I am trying to notch 3/4, 7/8 and 1" 4130 chromoly to make bumpers for micro sprints and sprint cars. Thanks in advance!!!

[On fire most of the time]

Ive sheared the teeth off a boat load of hole saws...but the rigid ones always seem to do me alright...besides that, theyre local (home depot) and cheap.

Beyond that...heres a couple places I found really quickly.

http://mo2ls.com/Merchant2/merchant....egory_Code=SCF

http://www.medfordtools.com/metalworking/holesaws.html

Stay away from starrett hole saws...ive had WAY too many of them lose teeth on the first time it touched tubing. Lost half a saw in less than half a second.

Hope that helps

[Fishy Jim]

How fast are you running these things? My gut says way too fast.

[On fire most of the time]

I dont know about the OP, but those starretts failed on me running 225 on 1.5 .120 wall.

I eased it in, cut all the way through the wall, and then *SNAPSNAPSNAPSNAPSNAPSNAP* half the hole saw was gone.

[Fishy Jim]

Well, your surface speed was right on, but did you have 3 teeth in the cut?

Hole saws are just like band saws. Too few teeth in the cut and it's gonna end badly.

I've had good luck with morse bimetal blades, but I've also tweaked them around the hub so the whole blade runs out.

Annular cutters are probably the solution. Better tooth support, and more like a milling cutter rather than a saw blade. The only issue there with having too little tooth contact is potentially chatter (which is still going to be miles beyond the cut quality of a hole saw).

[On fire most of the time]

I honestly dont know, but it was a 6 TPI saw.

I wasnt forcing it down hard...just keeping a touch of pressure on the arm of the drill press so that it was making contact.

One tooth probably caught, and caused the rest to follow...but it happend 3 saws in a row! Then I grabbed a rigid, and it worked fine.