Chisel Repair, regrinding the primary bevel.
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- Опубліковано 9 гру 2019
- Rob shows how he repairs a damaged chisel on the bench grinder to re-establish the primary bevel. He uses a Delta variable speed grinder though that is not necessary, either speed will do. He also uses our new 80 grit, three sided CBN wheel robcosman.com/collections/sha...
Also our grinder is modified with the Wolverine tool rest, robcosman.com/collections/sha...
This method works well on plane blades as well.
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I was gunna do mine freehand but now realise how important that rest is for a nice grind.
Thank you Rob, for another informative video!!! Keep them coming.👍🏻
CBN wheel sure looks like the way to go. Thanks Rob.
Wow, that was very helpful. Easy to follow and I think I can do this.
Thanks for this video.. I also use bench grinder to sharpen cuticle nippers, nail cutter..👆😉
awesome cool insights!
Also works great on plane blades!
Hi Rob. Thanks for showing this. Very helpful! Question - I realized after a while that I had the angle set wrong on my honing guide and I had put a 37 degree bevel on the blade of y #4 smoother. Should I start over and regrind it? Can I do anything from this point? I actually have 3 bevels on it now.. the 25-degree original, a 30-degree secondary and this 37-degree tertiary. Thanks for any advice!
Thanks Rob. I have trouble doing the 17 degree chisel with same set up. Any suggestions?
Rob great video what is the brand name of the protractor that you used and where can I buy it?thanks
@RobCosman Do you have any videos on resetting primary bevel on curved chisels? I have a box of damaged chisels (I am a wood carver). While I can reset the bevel freehand, it's never quite right, particularly on a v tool or out cannel gouge). It makes sharpening them time and again more labor intensive. I need a process to reset. Thanks in advance!
Rob - I am repairing some old Stanley 750s. On one of them, a previous owner put a bevel on the back side. When restoring this, would you first regrind the primary bevel and then flatten the back or vice versa? Thank you
How about a Japanese chisel that has a hollow grind on the back side. What if you start to get close to the part on the back that is hollowed out?
Hello Rob. Beeing a bit familiar with how the hardening of the steel works, dont you think that you will loose some of the hardening by grinding the chisel dry? the tip becomes very hot which affects the steel. Have you considered this? Or is the idea that when you continue to sharpen the edge with the wet stones you will remove the affected steel? Thank you for excellent videos and craftmanship.
With no metallurgy background I can only speak from practical experience, no difference in edge retention after the process compared to before.
Hi Rob, what dia is your CBN wheel. I only have a 6" bench grinder, so I'm concerned about the effect of the concaved face on tip durability. Should I be concerned, or perhaps increase the effective angle by a few degrees, say 27 deg?
Steve Bosun mine is an 8” wheel, which I definitely recommend. The 6” grinders, like you point out, creates too much of a hollow. I would bump it up to somewhere between 26-28°, depending on the chisel.
Who makes that protractor?
Can you provide a link to the tool rest that you are using, please?
Jack Moskowitz robcosman.com/products/wolverine-grinding-jig
I`ve been fighting getting one of those wheels, I think it`s a loseing battle
surrender!
What’s the alternative to having a bench grinder? A very low grit stone? Was considering buying a low grit diamond stone.
possible but takes a while
I used very coarse diamond stone for grinding handplane blades and it took several hours. It was so frustrating that I ended up getting a bench grinder.
@@jaritiukuvaara9319 bought a cheap 180/220 grit one from Woodcraft last week. Haven’t tried it out yet, though. Tried with a 330(?) grit one, and took me like 6 hours to still not take it from 25 to 20 degrees.
@@JeremyB8419 I had DMT D8XX 8-inch Dia-Sharp Continuous Diamond - Extra-Extra-Coarse. I was able to return it.
Great demonstration! Does the Wolverine tool rest have angle stops to take the guess work out of it?
No. It does come with a plastic guide jig, but as he said, that may not help if the chisel has a taper. Also, their marketing really only shows turning tools, so I'm not sure if the jig even has the correct angles for normal chisels or plane blades.
The angle is affected by the distance of the tool rest from the wheel and the angle of the tool rest, so presets wouldn't really apply. The way Rob did it works and is simple enough that even I can do it. The Wolverine set up is nice for this operation and the lathe work that drove its invention. That said, I wish I had even half of Rob's eye/hand skills when it comes to the grinding and so much more, but I get by and get better.
Wouldn’t that chisel now have a hollow point on its first bevel?
hey ! how do you regrind your dull router bits ??
If and when, I use a flat diamond stone, Trend.
Will 3600 rpm ruin the CBN wheel ?
No. Just keep the pressure light. We used a 3600rpm 8" grinder in a college wood room and it was fine. One of the best things we invested in while I was there, as teenage boys are not nice on chisels and I'd do a lot of re-grinding.
I was just wondering Rob if you have ever used a whet stone grinder such as tormek for regrinding and sharpening chisels. I have both a bench grinder and tormek have to say the would prefer the tormek, but that's much opinion. Just wondering if you have used them before.
I find the Tormek too slow for me, i get why folks feel safe using it but my type "A" doesnt fit!
@@RobCosmanWoodworking I agree with them being slow, but I prefer tormek as I use it for my woodturning tools, leaves them a finer cutting edge. Thanks for the reply
@Pat Mahon what's that supposed to mean?
How do I flatten the back of a vintage beat up chisel?
elbow grease and a flat aggressive stone
The Atoma 140grit diamond stone is a good place to start
@@mylesjohnston8759 that looks interesting! Its like a metal lapping plate with a layer of tough diamond grit sandpaper, do you have experience with it?
Lego Man 12345 12345 I do with the slightly less course Atoma. However i hear it is very good. For what your looking for
@@mylesjohnston8759 I will do some research, thank you!
So I am confused about stropping. I've been told to never strop chisels and I was told to always strop. What's the right answer?
I don’t, no need if 20 seconds on the stone produces an edge that you can’t see room for improvement.
ouch, don't let the dog have it again. :)