I do a lot of 2 stroke engine work and just lately we have been struggling with an issue about heat cycling.
Most modern 2 stroke engines have cast aluminum pistons along with a water cooled cast aluminum cylinder which is nicasil coated then bored and honed to size. We know that if we use an...
We have kind of figured this one out. What I normally do with a cutter of this size is pre-heat the arbor, (which by the way, I neck down to about 3/8" before it goes into my indexer to reduce heat loss)then pre-heat most of the cutter w/o getting too much heat near the pockets. I use a...
"Does the copper in the 17-4 cause it to wet so well it sucks all the solder away from the carbide?"
YES. I believe that is exactly what is happening. The first ime I did these, Inoticed that the solder stuck very well to the stainless, but not to the carbide. And when I knock a piece...
Thanks. I'll give it a look. And no the local industrial house is no help. They no nothing exc what they can read in a catalog. I can do that.
Keith Durkee
www.toolgrinder.com
We have been having trouble with soldering carbide tips to a 17-4 stainless body. We have not had trouble with any other mat'l. It seems that the solder doesn't stick to the carbide, which doesn't make sense to me since the solder sticks to the carbide okay when soldered to other materials. Can...
Good stuff on the site Tom. I am pretty well convinced that the etching was the problem. I just want to understand why. We cut a lot of form tools with the EDM and have not run into a problem like this. I would think it would show up there, too.
Thanks,
Keith
Keith Durkee
www.toolgrinder.com
I guess I wasn't near complete enough in my first post. Sorry guys.
The tools still broke after grinding the etchings off. The etchings were done with an electrical DC etcher. Not electro-chemical. We have a new one that was never etched running right now, bet we also left the neck .015"...
Metalguy...I guess I forgot to mention that the tools were made from solid carbide blanks. Do you know if there would be a similar effect on carbide?
Keith Durkee
www.toolgrinder.com
I realized that we had created a riser after the first one broke out on demo. We took the tools back to the shop and ground the shank down in the area of the etching. The shank was already reduced in that area. We just took an extra .003" off and got rid of the etching marks. We have had...
We had a problem with some custom tools that we made breaking for no apparent reason. We electrically etched the tool # on the shank. Is there a disturbance caused in the area by the electrical current that could cause the tool to be weaker there?
