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Forum topic by Turns4wood posted 04-01-2019 03:19 PM 586 views 0 times favorited 8 replies Add to Favorites Watch
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Turns4wood

51 posts in 230 days


04-01-2019 03:19 PM

So I have the opportunity to buy a grizzly 1/2 hp mortiser for a $100.00 not sure if the part that hold the work piece in is there but when I talked he said it was lightly used has anyone used this and are they any good I relize it is the chisels more than anything that makes the difference. Thanks ahead of time.

Jerry

-- Nothing better than sawdust on the floor


8 replies so far

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therealSteveN

3353 posts in 1022 days


#1 posted 04-03-2019 06:31 AM

Very simple machines, essentially it’s just a lever to pull down the chisel. You were correct most of the work is done by the chisel, so buy nice ones, and get good sharpening stones for them. If it looks new, I’d grab it, but being a cheepie, I always start less than asking….

As far as work holding, tools like the outrageously price Powermatics have better than average work holding, but you can make jigs to hold the stock where you want it to be. An X Y vise may be of help to some. I’ve always found I could cut a few pieces of wood to hold them in place, and just move the stock by hand. The little forked fingers you may want to pick up one, or make something, it does help separate any stuck on pieces from the bit/drill.

You have your line, you first cut the 2 outside shoulders to get them square, then just work one side to the other, and nibble off the next over, doing a partial leapfrog taking about half the next chunk and cleaning the already done part with the rest of the chisel, It moves a lot quicker than it sounds.

“I’ve found the Fisch brand bits to be awesome. I use the 3/8 about 95% of the time I would NOT buy a set. If you found you needed a different size, get it. But 3/8” being 1/2 of a 3/4” stock, it works. It would also work on true 4/4 stock, or even a bit larger. Seeing the fastest way for me to cut tenons is on the TS, working them to 3/8” out of 3/4” stock is also the best scenario.

-- Think safe, be safe

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runswithscissors

3057 posts in 2473 days


#2 posted 04-04-2019 01:18 AM

Didn’t we use to have a search box, or am I not seeing something? Anyhow, a while ago, I did a bloggish sort of thing about modifying a mortising machine (Delta bench top) to have an X-Y table, and toggle clamps for hold downs. On most of these, the original hold downs are not very effective. Just as the lever arm gives you great force to cut the mortise, the uplift also has a lot of force.

The 1/2 hp of the Grizzly machine should be plenty. Some models have bigger motors, but all it has to do is spin an augur bit, and not a very big one at that.

My favorite chisel for 3/4” material is 5/16”, as it leaves plenty of wood on the sides, but also allows a stronger tenon than 1/4”.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View teejk02's profile

teejk02

502 posts in 1573 days


#3 posted 04-04-2019 03:49 PM

I own the Delta but guessing it’s the same basic machine. I never use the hold down because I don’t seem to need it. I do have blocks (the exact same height as the table) clamped to the table to provide longer support. And I take shallow cuts in multiple passes which lessens the chance that the piece will move. It doesn’t take long once you get into the rhythm.

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pintodeluxe

5970 posts in 3261 days


#4 posted 04-04-2019 04:21 PM

The GO645 looks to be a clone of a Delta Mortiser I have. Very standard setup. It will work better than chiseling mortises by hand that’s for sure. Mine worked great on thousands of mortises. I broke internal parts a couple times, but it was fixable. Finally I upgraded to a Jet X-Y mortising table, which I much prefer.

I say go for it. They are a fun tool to play around with.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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runswithscissors

3057 posts in 2473 days


#5 posted 04-04-2019 06:18 PM

As for mortising machine technique, I deviate somewhat from what others have said. After making the first plunge (the hardest because all four sides have to be cut at once), I just continue on down the row, overlapping a little, so that the chisel only has to cut 3 sides. I have not noticed any tendency for the chisel to deflect, as others have warned against. Possibly, however, this is because I use the 5/16” chisel for work in 3/4” wood, rather than the 1/4”. The 5/16” is sufficiently rigid to resist flexing.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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teejk02

502 posts in 1573 days


#6 posted 04-04-2019 08:41 PM



As for mortising machine technique, I deviate somewhat from what others have said. After making the first plunge (the hardest because all four sides have to be cut at once), I just continue on down the row, overlapping a little, so that the chisel only has to cut 3 sides. I have not noticed any tendency for the chisel to deflect, as others have warned against. Possibly, however, this is because I use the 5/16” chisel for work in 3/4” wood, rather than the 1/4”. The 5/16” is sufficiently rigid to resist flexing.

- runswithscissors

I don’t think it is the chisel deflecting as much as it is “slop” in the machine itself. It’s basically a modified drill press and for $200-300 (haven’t priced one lately) you get the same precision as any other similarly priced tool. I punch shallow cuts along the entire mortise, then move back and repeat a few times. Once the mortise walls are established then go for the gold…the path is pretty much defined at that point so hard to goof up.

View Turns4wood's profile

Turns4wood

51 posts in 230 days


#7 posted 04-05-2019 02:17 PM

So I bought it it is the older version 1997 1/2 HP but runs and makes a square hole like it should. I have the chisel’s from 1/4’’ thru 3/4’’ I have used others machines but wanted to get something for myself it is nothing fancy.
Jerry

-- Nothing better than sawdust on the floor

View Jared_S's profile

Jared_S

210 posts in 407 days


#8 posted 04-05-2019 06:59 PM

I had the jet version (which i just sold for $100) it worked as advertised. I only got rid of it because I picked up a 1200lb floor model mortiser. Having a xy table is a nice feature but i got along without one.

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