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Hello my friends …I picked up an antique Delta Rockwell 4" jointer…...presently it has 4" x 19/32" x 3/32" knives in it. I'd like to have a spare set just in case , but the ones I found online are quite pricey.
My actual question is : Can I use the more common 4" x 5/8" x 1/8" instead without creating any problems ?
I realize that it's only a fraction of an inch , but I'd rather know for sure before investing in an incorrect item.
Thank you : )
 

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I don't think it will cause any issues. Are the knives in the machine the originals? If so, expect that they have been sharpened and have lost some "height" over the years. Another note I would stick with the regualr HSS knives as opposed to carbide. They are easier to sharpen and about half the price.
 

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Discussion Starter · #4 ·
Point taken , Jim…I was just wondering if the newer blade dimensions were created because there were some problems with the old dimensions ?......it's only one thirty-second of an inch difference in thickness and height and I'm sure that the height could be changed after only a few sharpenings. Thanks for your input , Jim : )
 

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Discussion Starter · #5 ·
Hi Ken …I guess we were both typing at the same time…...I can only assume that they are the original blades , but they sell brand new ones with the same dimensions. Right now , I have the cutterhead out of the jointer and I am going to see if my Delta 6"x 5/8" x 1/8" will be held securely (or even fit into the grooves) by the chip breakers/locking devices. Thanks for your input , Ken : )
 

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You state that the blade is 13/32 thick if I'm reading your post correctly. 1/8 is only 4/32 so I wouldn't use them. You stated that the were only 1/32 off so I'm guessing that you post has a mistake in it.
 

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My question would be-Is there enough adustment in the head to accept the thicker knives.
If so, I don't see why it would matter. Is someone else seeing something I'm not?
That's why there is height adjustment in the head.

I've never worried about the height being identical. How could it be with sharpening over time?
 

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Guys - I have found that the heigth can change drastically after only a few sharpenings. NOW, this all depends on the method of sharpening. If these knives had been in my shop they could have, theoretically, met a brad or two in their work environment. Having done so my sharpening guy would have sharpened them mechanically and would have ensured they were the same heigth (so there goes the heigth, and quickly). I told him he didn't need to make the knives the same heigth as I adjust them individually when installing them. Now, if this machine is a true antique, the knives were probably sharpened by hand and with a stone) making the heigth reduction MUCH slower. I am sure all of have already thought about these possibilities. In todays market, the steel in the OEM type knives is CRAP and you need to ensure you're getting M2 or better steel as they hold an edge and will stay sharp longer. It really pays off in the end to pay extra for the good steel. Another trick I have found is, as my planner knives are getting dull the noise level is increased. So, after a few hours of use I hit the knives (leaving them installed) with a small wet stone to remove any small nicks and residue picked up during use. By doing this I extend the sharpening periodicity by 3 or 4 times. Hope this helps and gives someone new information. Cause this is what this is all about, correct? Information sharing..
 

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Find something that is 1/8" and see if the gibs will be able to be tightened. If they work I'd go with the thicker knives. I'd want the gibs to be able to have all of the gib touching the blade. Not just the top. If it was only the top the blade might get some wiggle to it and allow the blade to slip.
 

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Hi Karson….I tried my 1/8" knives from another jointer as mentioned above and there is plenty of room left over. Thank you for the suggestion and have a great weekend.
I'm going to order the 4" X 5/8" X 1/8" knives .

Thanks again to everyone that helped me answer this question : )
 

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Discussion Starter · #15 ·
It was /is the best price and highest quality {without going to carbide} that I found anywhere , including the shipping charge : )
 
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