The Craftmans Shop > New from Old
Rockwell 6" Jointer Rebuild
sparky961:
One night while the castings were soaking, I cleaned up the blades on the surface grinder at work. Although they de-rusted nicely, they were still a little pitted and both the back side and bevel needed to be cleaned up if I wanted to get a good edge on the blade. Now before anyone chimes in with "hey, you can get those for like $0.75 on Amazon", this was partly because I wanted some practice on the surface grinder working on thin parts. A compound sine plate is a very handy thing to have!
The blades started out each with a bit of twist or bow. I knew better, but thought I could take it out by just popping it directly on the magnet. I SHOULD have shimmed it before turning on the magnet because I didn't end up completely flat. They will flatten when clamped in place, have no doubt, but I have learned the lesson first hand.
Here's a little gadget I made for honing the knives after re-grinding the bevel and back.
Notice in the last picture how the screw on the bottom away from the knife is used as a single point of contact and a fine adjustment for the angle of the micro bevel. My only complaint about this tool is that the screw tended to squeal in use like fingernails on a chalkboard. There's probably a simple solution but I just soldiered on.
sparky961:
And finally, the current status of the project? Paint. I worked at mixing a few colours to get a reasonable approximation of the original. I don't think there's value in being really picky here. It's not like I have an extremely rare antique - as far as I know. The uninformed wouldn't know the difference anyway. It's starting to look very nice indeed....
awemawson:
Excellent work Sparky :thumbup:
I love the idea of a heating coil in the citric acid, I must work on that one.
PekkaNF:
Very nice. Derusting looks exactly as it should. Time and temperature are variables you have to work with. It never has been a big problem to me to leave a part overnigh to very diluted bath, knowing that tomorow is just another day and if it needs one more day or half - big deal.
Another trick I learned that some drain cleaner (liquid plummer) stuff removes paint fast.
I had some really coarse rusted and pachy paint cast iron lumps. I put that on builders pail, poured over over 60 C degree hot drain cleaner and used long nylon brush to clean the paint and grot. Unbeleivable. All paint come out in 15 minutes. You have to have visor long cloves. Then I dumped the lot on another plastic pail and put one measure of clothes washing detergent (not the zeolite one, but real) and rinsed with hot water...The surface was very silvery and bare metal. Quick spray over of mild phosphorous acid and it was ready to mask and paint.
Pekka
jcs0001:
Sparky
It is looking great now. I hope the gib strips aren't crappy aluminium like mine. I replaced mine and it helped the workings out a lot.
A coat of floor wax on the table and fence surfaces will work well one it's together. It lets things slide nicely and protects the surface. I buff it in and so far haven't had any trouble with finishes on wood I've put through it.
John.
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