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? on setting jointer knives

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jCarroll

12-06-2002 08:13:59




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I have had the knives sharpened on my 3 knife 4" Delta jointer. Will use a dial indicator to set them so I'm confident I can get them parallel and set the same height.

Should they be set 'exactly' the same height as the rear table, or a little high - or a little low?

Any general advice on re-setting the knives?




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jCarroll

12-09-2002 21:32:44




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 Re: ? on setting jointer knives in reply to jCarroll, 12-06-2002 08:13:59  
Thanks a lot for your suggestions, guys.

I'm going to use the straightedge technique, with the dial indicator for a final check.



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Tom

12-07-2002 18:34:01




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 Re: ? on setting jointer knives in reply to jCarroll, 12-06-2002 08:13:59  
My manual which came with my 4" Delta, about 20 years ago, says to use a straight and smooth piece of hardwood about 12" long and set the knives to just touch it as you turn the head backwards. It doesn't say anything about moving the stick as the knife contacts it and moves on. Therefore, they recomend setting the knives at the same height as the rear table.



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VaTom

12-08-2002 08:20:22




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 Re: Re: ? on setting jointer knives in reply to Tom, 12-07-2002 18:34:01  
Hi Tom,

"Just touch" going backwards is going to be the same thing as a small indicator (wood or steel)movement going forwards. The difference in recommendations is it's easier to adjust the amount of movement forward than whatever is "just touch". I'd use a dial indicator if I was trying for that approach. Next time you change knives, give it a try. I've done both.



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Tom

12-08-2002 17:16:12




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 Re: Re: Re: ? on setting jointer knives in reply to VaTom, 12-08-2002 08:20:22  
Was just quoting what the book said. From that it seems they want them as close to even with the back table as possible.



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john d

12-07-2002 07:03:00




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 Re: ? on setting jointer knives in reply to jCarroll, 12-06-2002 08:13:59  
I've always set my knives so they are level with the outfeed table at highest point. A straightedge of some sort will work fine to determine this. A dial indicator will also work, but may be more useful to "check" than to actually "set" the knives. Another work-able method on older machines that have no screw-type adjusters under the knives is to use a pair of bar magnets on the outfeed table extended over the knives to hold them at the desired level while tightening them.

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mj

12-06-2002 14:40:18




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 Re: ? on setting jointer knives in reply to jCarroll, 12-06-2002 08:13:59  
You can take a piece of scrap stock (1x2 is good) that is smooth and flat on one edge and set it on the outfeed table with one end contacting the first blade to be set. Rotate the cutter head by hand and, using the edge of the table as a reference point, mark the spot on the stock where it just begins to lift off the table ; keep rotating the head until the stock just comes back down and touches the table again and mark it . Use these marks to get all the cutters aligned and set for depth.

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Bob G

12-06-2002 08:21:24




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 Re: ? on setting jointer knives in reply to jCarroll, 12-06-2002 08:13:59  
I have read and alway done it this way. I use a piece of glass place on the output table with a weight on it to hold it down. I then adjust the blades to just touch the glass. Have not had any problems doing it this way.

Have also hear about using a level in the same way. This procedure may actually be easier since you can get to the bolts without removing the level.

BG



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VaTom

12-06-2002 14:32:38




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 Re: Re: ? on setting jointer knives in reply to Bob G, 12-06-2002 08:21:24  
I set mine using the straightedge from a combination square. When the knives move the straightedge, sitting on edge on the outfeed table, 1/4" it's right. The answer to the jCarroll question is, above the outfeed table. I've tried a dial indicator but find I do better with the straightedge. My jointer's got 12" knives, but the process is the same, one side at a time.



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