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Question about bench top mortises

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Forum topic by sandhill posted 10-15-2013 03:30 AM 530 views 0 times favorited 11 replies Add to Favorites Watch
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sandhill

2122 posts in 2576 days


10-15-2013 03:30 AM

Topic tags/keywords: shop fox bench top mortise question

History
I cannot compare this machine to any other because I have only use two SHOP FOX mortises. About ten years ago I bought a SHOP FOX bench top mortiser and used it one time then sold it not having any more need for it and when I did I just cut them with a Forstner Bit and chisel plus I did not like the noise it, thinking I did not know the correct way to set it up even though I did a lot of research and did do it the way everyone said.
About seven years ago I bought another one and had the same noise problem and started using it less and less but now I need to knock out a lot more then I am willing to do by hand. I bought a new bit set and set it up the correct way and sill had noise but after inspecting the bit I noticed that the metal had been rubbing inside the chisel just above the top of the flute at the neck. I took out the bit and put it in my drill press to see if and how much run out there was and found there to be virtually none. I then inspected all 5 of the others I had and found the same results. I then put the drill bit in the chuck of the mortiser and found that the bit was running out 3/32” concluding that the run out seems to be the motors shaft.
So what I would like to know is do all you bench top mortiser owners have the same problem?

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/


11 replies so far

View gfadvm's profile

gfadvm

10855 posts in 1342 days


#1 posted 10-16-2013 01:36 AM

I do not have that problem with my Jet benchtop mortiser. But the POS they refer to as the holddown….....it is a problem!

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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sandhill

2122 posts in 2576 days


#2 posted 10-16-2013 02:09 AM

I used mine today and still can hear the distinctive ring of metal spinning against metal but it did get the job done and I only had a small bit of clean up on the mortises. It took me about 30 Min to cut 8 of them 3/8” X 3” X 1.250” start to finish; I will say the walls are straighter then I can do by hand when in a hurry. My hold down seemed to work well I did get a clogged chisel once and the bit stopped turning but I hit the stop real fast and no damage was done, I was cutting into hard maple.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

View CharlesA's profile

CharlesA

1419 posts in 450 days


#3 posted 10-16-2013 02:46 AM

It’s worth checking that the collar that holds the chisel in place is exactly the right size. If it is slightly loose, the bit can get skewed in the chisel.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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firefighterontheside

4273 posts in 509 days


#4 posted 10-16-2013 03:12 AM

Mine makes that noise too, I think it’s worse with the smaller bits as they are easier to push askew. I think it’s just gonna happen. As chips come off the chisel some of them go in the bit and force it into the chisel.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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sandhill

2122 posts in 2576 days


#5 posted 10-16-2013 03:17 AM

I guess I will just live with it. Its is a lot faster and no one sees the inside of a mortise I will just turn up the music in the shop when I use it.
Thanks guys

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

View pintodeluxe's profile

pintodeluxe

3359 posts in 1465 days


#6 posted 10-16-2013 03:23 AM

High quality bits are quieter. You are right, it is caused by runout of the machine and clearance built into the bits. Do make sure that you set the drill bit slightly lower than the chisel. I use a quarter as a spacer for the 1/2” chisel, and a dime for the 3/8” or smaller chisels.

If you don’t set the drill bit lower, it will make an awful noise.

Good luck.

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

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sandhill

2122 posts in 2576 days


#7 posted 10-16-2013 04:59 AM

@pintodeluxe ShopFox said to buy a better bit set so I did $119.00 for a 1/2” one. I put a gage on the drill chuck and it runs out 3/64” which I would consider unacceptable. Lesson learned if I got the chance to buy another one it would be a higher quality one and not the two to three hundred dollar ones. @ firefighterontheside I asked SF about that because I thought it was to loose but they said that was built into the machine for clearance when you tighten the cap screw that hold the chisel.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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pintodeluxe

3359 posts in 1465 days


#8 posted 10-16-2013 06:32 AM

Woodcraft sells good bits for $15-20 each.
I also take the drill bits over to the bench grinder and give them a quick twist across the wheel. This decreases the drill bit diameter slightly. I do it to avoid the little round divot that can appear in a mortise. It doesn’t affect cutting performance, and quiets the bits down too.

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

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sandhill

2122 posts in 2576 days


#9 posted 10-16-2013 02:38 PM

The one I got I think it’s a carbide tip and chisel it cuts very well. I did notice it was chewed up a little where it disappears into the chisel I may lightly grind it smooth and see if it helps.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

View TheDane's profile (online now)

TheDane

3773 posts in 2315 days


#10 posted 10-16-2013 02:54 PM

FWIW … I have had excellent results with the premium bits/hollow chisels from Lee Valley ( http://www.leevalley.com/us/wood/page.aspx?p=53252&cat=1,180,42240,53317&ap=1 ). I give the bit a little shot of Opticut XL every so often.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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sandhill

2122 posts in 2576 days


#11 posted 10-16-2013 03:05 PM

Thanks I will have to give them a try.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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