Why bother investing in expensive grinding machines when the saws can be "finished" by hand and still sell?

I don't know which vendors were used, but I'm very selective about which ME vendors I use. Most of my cutting tools are bought from industrial suppliers. An exception would be premium items from Arc.

Andrew

Ahh, so not cutting a wider slot than design. Eccentric rather than wobbly.

That’s OK, – well par for the course – as many cheap slitting saws only cut (to the maximum depth) on part of the circumference. Look on it as paying the same as a better quality item which uses (and wears) rather more of its teeth than yours. On yours, some teeth will be cutting and possibly some only rubbing (which blunts them quite prematurely). So likely good enough for a single job but not so much longevity, if used regularly and/or often, than a higher quality one.

The wobble saw I used cut a slot from blade kerf to about 10mm wide, depending on how it was set.

Likely need an eccentric arbor, with appropriate run out, so the saw can be turned to accommodate the eccentricity. Don’t think I would bother.

On the subject of slitting saws I am having difficulty sourcing a very small example. I need a 1/2" dia. x 1/16"wide saw to produce a key-way in the crankshaft of a Channel Island Special 10cc. I require to get up very close to the crank web without marking it.

Can any kind soul point me in the right direction, please?

Mike

That's a tiny diameter. Have you considered some sort of dental bur presented at an angle? The problem is the obvous one of controlling the thing but if you have a compressor the high-speed handpieces and burs aren't that expensive but creating a fixture to hold it would be entertaining.

pgk

I'll probably get vilified for sounding like a broken record but I've found the cheap import ones are the worst offenders by far. I usually end up making a wide arbor to grip the cutters nearer to their periphery but of course you lose cutting depth.

Thanks Jason, you are indeed a star. I was missing some lateral thinking – not unusual for me.

Working on an original Jensen kit, purchased in 1949 by a now deceased friend. Rescued from the top shelf of his workshop, and which had had very little work completed.

Mike