Question re The Carbatec Benchtop Chisel Mortiser

**RoyG** · 21st April 2015, 06:57 PM

I have a Carbatec Benchtop Chisel Mortiser (http://www.carbatec.com.au/carba-tec...ortiser_c20063) which works pretty well, except for one niggle.
CT-HM16D.jpg
The machine is not fitted with a hold-down clamp. This sometime causes problems when using the half inch or larger chisels. The chisel can be hard to extract at the end of the stroke, and with no hold-down for the workpiece, the workpiece is often pulled up out of the vice when you try to extract the chisel. I've tried using candle wax on the sides of the chisel, but that doesn't seem to make any difference.

I've looked at options for making a hold-down device of some sort, but so far haven't worked out how to do that. Short of buying another Mortiser that does have a hold-down clamp, does anyone have any ideas ?

Thanks,

Roy

**Enfield Guy** · 21st April 2015, 07:22 PM

You could wetstone the chisel, maybe starting a cm or so up from the cutting edge thereby narrowing the chisel and preventing the chisel from binding on exit. It is after all the cutting edge that matters, if the rest of the chisel is narrower it will be less inclined to bind. My 2c worth.
Cheers

**specialist** · 21st April 2015, 07:28 PM

I also found that in addition to honing the outside, I also all but polished the inside so that the chips ejected smoothly. If they don't the chisel will get hot and swell and jam on the first hole. I also found that if the chisel is sharpened too finely, the corners will turn outward and jam in the hole. Trawl youtube and watch all and any of the videos that deal with the subject, it will be a help.

Rob

**Treecycle** · 22nd April 2015, 10:40 AM

There are a few tips in this thread https://www.woodworkforums.com/showth...=194059&page=2 Some the same as above and others from a different angle.

**mark david** · 22nd April 2015, 03:43 PM

I had this machine for a while before building a horizontal router and then sold it.
Certainly had the same issue, working your way along the mortice cut in stages helps as you mm are not going too deep with each cut.If you take one deep cut to start it would certainly jam up.

I never got round to modifying the clamping mechanism but you could probaly drill and tap into the slide and fit a vertical toggle clamp or similar arrangement.

I never really got particularly clean or accurate cuts with mine

I also found overtightening the clamp didnt help as it deflects the back fence, which is a separate part, this results in a slightly angled mortice which is not desirable.
There was an issue with the machining on the inside face on my fence where it is bolted on.This resulted in it not being square to the base.

**Trav** · 1st May 2015, 11:27 PM

Hi Roy

Have a look at what I did. I used the automaxx clamps from kreg. It cost a bit for the clamps but it works a treat. The automaxx clamps Can be used in other ways too - I've got a similar setup for my drill press. And I'm thinking of using them in a crosscut sled.

See here https://www.woodworkforums.com/showth...light=Automaxx.

Trav

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