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Help! Craftsman 4 3/8" Jointer Knives

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Forum topic by Brad posted 2082 days ago 2752 views 0 times favorited 7 replies Add to Favorites Watch
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Brad

121 posts in 2276 days


2082 days ago

Topic tags/keywords: planer jointer blade joining sharpening

I have had an old tarnished Craftsman 4 3/8” jointer sitting in the corner of my shop for awhile. Well last week i decided to restore it. Everything for the most part is in great shape after dismantling, polishing, and lubing. However I’m having a hard time deciding what to do about the jointer knives. I use the scary sharp system for hand plane blades but what about jointer knives?

Suggestions?

Just for fun here is the model number 103.21820

-- Brad / www.bradfordwoodworking.blogspot.com


7 replies so far

View Silverdollar's profile

Silverdollar

1 post in 2081 days


#1 posted 2081 days ago

Hi,

I have the same jointer that i have used in rebuildiing a cottage – the motor failed and it has no markings as to RPM. I am runinng a 5 1/2” drive pulley to a 2” arbor pulley – if saimilar to yours, what speed motor do you have – Sears has not been a help!! Thanks.

Silverdollar

View alanealane's profile

alanealane

365 posts in 2393 days


#2 posted 2081 days ago

I have an ancient Power King 4” jointer. The motor is a newer (circa 1970) 1.5HP GE motor that is 1725 RPM at full load. The motor to cutterhead speed ratio is approximately 2:1.

As for sharpening, that’s a difficult task unless you happen to have a JET or Tormek grinder, or one of those Delta-style grinders with the horizontally rotating wheel.

I would recommend the Scary-Sharp system, which is wet/dry sandpaper attached to a piece of float glass. With some practice I think you could get the hang of sharpening the jointer knife by hand using this method. Unless you have a chipped edge, Don’t worry too much about the primary bevel. Concentrate on honing the secondary bevel and maybe even a tertiary (3rd) bevel like David Charlesworth does with handplane blades.

I haven’t been so bold as to sharpen my knives yet. I just buffed the surface rust off of them with a wire brush and they seemed to still be holding quite an edge, even after 60+ years of use/storage!! They made things to last back then, that’s for sure.

When the time comes to sharpen my knives, I will either send them to a professional grinding service (where they will charge around $25 for the job), take them to the local community college’s machine shop and surface grind them, or I will try out the Scary Sharp method.

I fear there is no other way to get out of this inexpensively. There are several machines made for just this task, but they run $200 to $400 or more!! Maybe that would be a wise investment, but right now, I’d rather spend that kind of cash on some exotic wood or a Leigh Jig or something.

I actually only use my little jointer to “rough in” really wavy edges on boards. I use a jointer plane to put a final flat surface on the edge.

JUST MY 28.5 CENTS WORTH!!! ;-D

-- Lane Custom Guitars and Basses

View Brad's profile

Brad

121 posts in 2276 days


#3 posted 2081 days ago

Silver dollar shoot me your email address because i have the original product manuel I can send you and it details what type of motor is needed and what rpm is recommended.

- Brad

-- Brad / www.bradfordwoodworking.blogspot.com

View jcecil's profile

jcecil

40 posts in 2153 days


#4 posted 2081 days ago

http://lumberjocks.com/topics/4170

look at the post from GarageWoodWorks. Looks like he has a pretty simple solution for using sandpaper to sharpen them. I have also seen people take a board and cut the angle (25 degrees or whatever you want them sharpened to) on the long edge of it and do it that way.

View Brad's profile

Brad

121 posts in 2276 days


#5 posted 2080 days ago

So last night i grabbed a beer and some cashews and spent some quality time with the jointer blades, some good classic rock and my scary sharp system. It worked well. The hone on the blades were sharp enough to cut my hands without even knowing untill about an hour later when i noticed a bunch of shallow cuts running across my thumbs.

I also pulled all the guts out of the motor and replaced the old cloth electrical lines with brand new wires. The motor runs strong even after probably 50 years!

Tomorrow after i pick up a new V-link belt and dial it all in we’ll see how it runs. When I’m done I’ll toss up some pictures.

- brad

-- Brad / www.bradfordwoodworking.blogspot.com

View alanealane's profile

alanealane

365 posts in 2393 days


#6 posted 2080 days ago

Good Job!!!!

-- Lane Custom Guitars and Basses

View SCOTSMAN's profile

SCOTSMAN

5035 posts in 2088 days


#7 posted 2080 days ago

I have a double tormek system both sizes and a horizontal wet grinder too specially built for planer blades.But my favourite sharpenner is a sixteen inch wheel that turns horizontally with an oils pump which floods the bade and keeps everything cool believe me this makes a great finish.I need to make alterations to get it to accept planer blades as it is originally set up for chisels and planer blades.It works great.Alistair

-- excuse my typing as I have a form of parkinsons disease

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