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Powermatic #10 Mortiser trouble with 3/4"1/29
I am able to cut 5/16th, 3/8, and 1/2" mortises fairly well with the #10. Unfortunately, the machine seems to really not like the 3/4" plunge, particularly the initial plunge. It smokes and in order to get any entry I have to virtually stand on the foot pedal and hold the 600 lb. machine from tipping and even at that I can barely get down a inch or so in cherry.
Typically, my mortises are 3/4" x 5", as I said in 12/4 and 16/4. Remarkably, the 719A is able to cut these thru mortises fairly well, all the way thru, but at this time more deftly than the #10. I knew I was pushing the 719 to it's limit, and although adequate I thought I needed something more heavy duty, hence the #10 purchase.
Can anyone shed any light on this problem? I am using the same bits that accomplish the goal in the 719. I "dress" or buff the outside of my chisels and tune the auger. I have even tried waxing the outer part of the hollow chisel, a little help, but not much. At this point to even get the 1" depth I have to run the auger about 1/8" proud of the hollow chisel, instead of the dime spacing. The product literature states "Accommodates soft wood mortise chisels up to 3/4"".
One person suggested that the lever action of the #10 isn't as powerful as what one can pull with the rack and pinion action of the 719. But, with probably hundreds of shops using this mortiser in history, one would think that it would have every bit of the driving boring power that would be needed. Any suggestions are welcome. Anyone with any experience with this issue? Thanks.
Paul, One thing I have done to help with 3/4" mortises is switch the 1/2" chisel into the mortiser and do all the mortises with that. Then I put the 3/4" in, and finish the job. It cuts faster and better, and is a lot more gentle on the fragile machinery.
I'm not an expert on mortisers, but I looked at a #10 once and thought it was on the smaller side. I ended up passing on it since it went for a lot more than I thought it was worth. For doing large mortises I think you may have been better off with one of the larger machines...like say a Wysong and Miles? 3/4" in hardwoods is a pretty big bite to take. Considering the literature you quoted states 3/4" being the max size in softwoods.....I think your pushing it trying to do that in hardwoods.....just my thoughts anyway.
Over the years, I have seen two of those Powermatic mortisers.
One had a broken foot pedal, the other had a bent foot pedal.
That says it all. I agree with JeffD that you need something heavier, ideally with an auto feed. I have a Maka oscillating chisel, but they are a bit wild to hit layout marks with - accurately.
Update. Thanks very much for the posts, all valuable to me. This has become a head scratcher journey of discovery and research I probably should have done prior to my assumption, my father always said...ass out of you and me. I thought, anything bigger than the 719A would just be better...Talked to Rich yesterday at Eagle/Oliver. He thinks the #10 is not enough machine for the 3/4" chisel based on the old oliver line up and perhaps the 3500 rpm speed is too much. Forrest City says that for a 3/4" bit 3500 rpm is definitely the problem, too fast, can't feed it fast enough they say, fine for small bits and they said on "those" machines there should be a way to reduce speed? The 719 is spinning at 1750 and the #10 @3500 rpm.
Wolf Automation can't do variable on a single phase motor, too much torque loss, has to be a 3 phase motor. Dead end unless I go new motor.
Small bits work fine in the #10. Then, Scott at Redmond says it is not my speed it is a chisel issue, and the #10 shouldn't have any problem with 3/4" bits and doesn't have an answer for why my bits work fine in the 719A. So, I am pretty confused.
Part of the problem may be that the machine did not come with a chuck key. It is a Supreme Chuck 6T cap 33 0-1/2 taper. I did find out from another owner the key is S-6. Jacobs doesn't have a conversion. I need a S-6 key, if you anyone has any ideas of where to find one? I am fiddling a Jacobs drill press key to tighten up. Maybe, that is a part of the issue.
Thanks everyone, yes, some are saying Wysong power assist. All dressed up she is and no where to go... above 1/2" that is, will update as I learn more.
No experience with either of your machines, but my initial thought was RPM. Perhaps, this could be addressed with the auger angle or grind.