chiped carbide tooling

[dilligaf]

i was givin some chipped carbide tooling is there a way to unsolder and resolder a new tip? Where would one buy the tips and solder and flux if needed? also the pic is of some that do not fit my lathe and someone can have for shipping.



jason

[Carld]

They are brazed on not soldered. I don't know where you could buy new carbide tips. They are so cheap I don't try to fix them, if they are chipped so bad I can't grind them for use I toss them. I use the brazed cutters till they are little more than 1/8" square.

If you want to save the carbide tips heat the shank until the tip falls off. Keep the heat off the carbide, it don't like a lot of heat.

[airsmith282]

id just grind them down to shapes you want and then they ae uable again , i moded a few of them plus got some pre modded from my uncle,

they are cheap to buy, mod them use them then pitch them out after they break again.

[JRouche]

Im frugal.. Ok.. CHEAP Those have ALOT of usable carbide. Just grind away. Specially if they happen to be a good grade of carbide.

I had a buddy that owned a small job shop. One of his lathes was a large (maybe 24"x10') reed-prentice. He used to take some major cuts on the thing and used insert tooling and brazed tools. With the brazed tool bits he would grind them down sometimes to where there was just a small lil nub of carbide left. And he would sink that lil 1/2" tool bit into some massive parts, making it work for its money.

I was always waiting for the lil chip of carbide to come popping off. Nope, never happened, ok, well I did hear the fatal crunch sometimes

Grind them till there nothing left. Wear a proper dust mask, he never did, but thats not what killed him either. JR

[deltaenterprizes]

These need a GREEN wheel or diamond to be sharpened. Grind away the steel with a regular grinder first.

[Carld]

Well, I have taken heavy cuts that heated the brazed tool so hot the insert came off so it can happen. It was a long deep pass, more than I should have been doing with brazed cutters. I've done that several times. The shop owner didn't want to buy insert tooling.

[rode2rouen]

Those tools have a lot of cutting left in them!!
Silver soldering or brazing are good ways to attach carbide tips to tool bits.

A couple of links:

http://www.carbideprocessors.com/brazing_wc.htm

http://screwmachine.org/cms/index.cfm?fa=viewArticle&b_id=355

Here's a bunch I got with a lathe a few years ago. The small are 1/2" square, the large 3/4".




Rex

[jdleach]

Over the years, I have collected oodles of carbide blanks, squares, rectangles, diamonds, etc. Whenever I have ground a cemented carbide bit (those doohickies you have in your photo graph) to nothing, and I like or need that size of bit, I whip out the old oxy-acetylene torch, the silver solder and flux, grind a new pad in the old bit, and sweat on one of my old inserts from the can.

Can't beat the cost. The only thing you need to be aware of is that the surfaces to be "cemented" need to be very clean and flux-ed well. Another is that if you are going to do some pretty heavy hogging, you may wish to use a silver solder with a higher silver content. I can't remember off-hand the various grades of silver solder, but suffice it to say that as the silver content goes up, both the strength and price go up as well. The cheaper grades of solder are good enough for general shop use.