grinding nightmare

swede2207

swede2207

Joined
Mar 10, 2002
Messages
323
Man..ive got a few things going right now. A few basic utility type knives for the boys at the fire station. for some reason when grinding i cant seem to get the point to come out right. Something always messes up,or i get scuffs in the blade from out of nowhere(it seems)ahhhh! Made me want to sell my stuff..Anyone else ever feel that way.Anyway is there a secret to getting the tip or point right every time? what are some techniques you all use?How do you get the point area to grind evenly like the rest of the blade. Tilting the tang out can cause it to get too hot fast,then you ruin the heat treat.Im stumped here i just had to quit for the night.Could the thinner steel be the culprit asnd i just have to be more careful?
Also..what speed buffer should i buy an 1800 rpm or a 3600, whats the difference? Thanks
Luke
 
mostly a convex or slack grind i guess. I have tried flat grinding and it works on the coarser belts but the finer grits tend to jump on my blademaster.so to get them "cleaner" I have been using convex grinds.
 
Luke,

I don't have any suggestions about the tip except when grinding the tip area it takes a lot less pressure since it is thinner and will tend to burn.

As far as the flat grinding goes and the belts jumping, well that is due to the seam in the belt on many of the less expensive belts. For flat grinding I don't take anything past 400 grit anyway and I use a Klingspor J Flex belt for that. I thought at one time that I would try a Trizact belt but they just don't work well for the way I flat grind. So its 400 grit J Flex and then hand work.

For hollow grinding I can go to a Trizact A5 with no difficulty whatsoever.

If you are ever going to be around the Houston area shoot me an email.

Craig
 
You'll have more control with a slower buffer, Luke. Leave the high-speed ones to the production guys.
 
Originally posted by swede2207
I have tried flat grinding and it works on the coarser belts but the finer grits tend to jump on my blademaster.so to get them "cleaner" I have been using convex grinds.
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Get a piece of pyroceram for the platen, and it will reduce the severity of that. Using good belts will eliminate it altogether.;)

One of my grinders is an old Blademaster also. You don't see many of those anymore.:D
 
Craig, thanks i get up to weimar or katy occasionally and ill definitely let you know when. Thanks for the advice..where do i get pyroceram,how do i attatch it to the platen?

Ill try the j flex belts and see what happens. Should i only get 400 grit or which grits should i get. Im using 3m belts right now guess cheaper isnt always better.
 
I don't know how anyone can buff a blade on 3600 RPM wheel without hurting themselves. I think the slow speeds are dangerous enough. All the recommendations I have seen or heard are for the 1800 RPM buffers.

RL
 
Good, clean belts (I use Klingspors), less pressure at the tip and, hat to say it but, Practice.
 
Originally posted by swede2207
Craig, thanks i get up to weimar or katy occasionally and ill definitely let you know when. Thanks for the advice..where do i get pyroceram,how do i attatch it to the platen?

Ill try the j flex belts and see what happens. Should i only get 400 grit or which grits should i get. Im using 3m belts right now guess cheaper isnt always better.
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Search for a persom named Steve Pryor, he sells pyroceram. You may also be able to get it at a local wood stove company, or glass company.

You just epoxy it to your platen, just make sure the platen is flat first, and round over the top,and bottom(of the pyroceram) to ease the way for the belt.
3M makes good belts. Are you buying them from a knifemakers supply outfit? If not, they may have overlap splice joints.

Belts sold by Pop's, Tru Grit, K&G, etc., are spliced to not create a bump. Either a finger splice, or very smooth butt splice.
 
The new Norax belts are a little thicker, and still flexible. They don't jump around nearly as much on my Pyroceram platen as some others in fine grit do.
 
Thanks fellas,looks like you saved me again. Hope you dont get tired of doing that . Anyway guess i better get my pops catalog out and get to lookin for some new belts,thanks for steve pryors contact info. Hopefully ill have some pyroceram by next week.
 
Originally posted by Danbo
Tip for shoplifters: If you're going to steal red meat, stick it down your pants. That way, it will be half cooked by the time you get home.
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If you're going to steal sausage, pepperoni or salami, stick it down your pants. They'll never ask.

Al
 
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