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Sharpening jointer blades

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Forum topic by MrRon posted 07-08-2018 06:12 AM 630 views 0 times favorited 6 replies Add to Favorites Watch
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MrRon

5571 posts in 3663 days


07-08-2018 06:12 AM

Has anyone sharpened their jointer blades by running an oil stone left/right across the knives while it is running? I came across this sharpening method while reading my Powermatic manual. As it is explained, you set the infeed and outfeed tables in line with the blades tip; then lower the outfeed table .003” and run the oil stone across the blades while it is running and if the blades are not all sharpened the same, lower the outfeed table a bit more and repeat. If it works, it sure beats removing the blades to sharpen them.


6 replies so far

View shugy's profile

shugy

2 posts in 377 days


#1 posted 07-08-2018 06:40 AM

While it is running!!? That just flies away from all logic, even after sharpening you need to run the blades across a stone to remove the rift built up by sharpening, you can see the line as you remove it just like sharpening knives.

View MrUnix's profile

MrUnix

7405 posts in 2618 days


#2 posted 07-08-2018 06:45 AM

I’ve seen the method described in several different manuals… never tried it through, and not sure I would want to – I’d rather just send them out to a pro. Here is the method described in an old Boice Crane manual:

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View AHuxley's profile

AHuxley

874 posts in 3741 days


#3 posted 07-08-2018 08:04 AM



Has anyone sharpened their jointer blades by running an oil stone left/right across the knives while it is running? I came across this sharpening method while reading my Powermatic manual. As it is explained, you set the infeed and outfeed tables in line with the blades tip; then lower the outfeed table .003” and run the oil stone across the blades while it is running and if the blades are not all sharpened the same, lower the outfeed table a bit more and repeat. If it works, it sure beats removing the blades to sharpen them.

- MrRon

What you describe is called jointing. Jointing followed grinding for in situ sharpening. Grinding is done stationary and jointing is done with the cutterhead running. It was mostly done on finish planers such as Olivers and rarely done on rough planers such as Powermatics, usually, you only see grinders on rough planers and jointing bars are extremely rare for jointers. There is a company (the name escapes me) that makes (or made) a power jointer for jointers which has a reference surface that sits on the outfeed table and joints the blades with a grinding wheel, saw it used once at an old iron get together, I think they were around $600. A quality planer (like an old Oliver) with jointed knives on the large diameter cutterhead will leave a finish better than any segmented cutter head (by a good margin) and even better than fresh Tersa knives.

It is scary on a planer with the correct OEM equipment and really scary on a jointer and the LAST thing I would use to joint blades (if I was inclined to do so) on a jointer would be a natural stone. I might attempt it with a diamond stone but nothing that could possibly shatter. FWW did a video about sharpening jointer knives in place 4-5 years ago and I think it is on youtube. A little more work in that you have to find TDC and lock the head off but a lot less intimidating.

View splintergroup's profile

splintergroup

2728 posts in 1642 days


#4 posted 07-08-2018 02:22 PM

I sharpen my blades while installed using a method described in FWW #224, Jan/Feb 2012.

Works great! Gets all blades exactly the same height and ultra sharp with a back bevel.

Measureagain posted a description here on LJs a while back

View Aj2's profile

Aj2

2321 posts in 2217 days


#5 posted 07-08-2018 03:39 PM

I’ve done it Mr Ron.
It did work for me but to edge joint 8/4 that had some very difficult grain running along the edge.
I prefer sharp knives meticulous set.
My manual also says it’s a last resort or something like that

-- Aj

View Woodknack's profile

Woodknack

12842 posts in 2799 days


#6 posted 07-08-2018 06:23 PM

Never heard of this technique, sounds exciting.

-- Rick M, http://thewoodknack.blogspot.com/

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