What's going on in your shop? Show us whats going on, and talk a bit about your work!

DanF said:
I know a lot of peeps don’t like the coil spring. My KMG Classic had one and I never had a problem with that feature. I actually prefer it over the gas strut. 🤷‍♂️
Click to expand...
oh, I like it- because it's a zero problem component! Thinking on swapping my gas shock out for one
 
Lorien said:
oh, I like it- because it's a zero problem component! Thinking on swapping my gas shock out for one
Click to expand...
Having an actual spring tensioner, and a direct 56C mounting was my main criteria for a grinder...... Everything else didn't really matter.
 
Crag the Brewer said:
Having an actual spring tensioner, and a direct 56C mounting was my main criteria for a grinder...... Everything else didn't really matter.
Click to expand...
a linear rate spring makes more sense to me than rising rate for that application
 
Lorien said:
a linear rate spring makes more sense to me than rising rate for that application
Click to expand...
I just didn't like the idea of all the grit and grime wearing out the shaft/seals..... I've heard that knife grinding could be an abrasive environment.
 
Roughly worked up three small guys to put the new Pheer 454 through its paces today. The two on the left are hollow ground, something I have never done before and that is going to be a challenge for me, lol.
38172BF0-E228-4C90-8CED-5C85DD96E554.jpeg
The far left is 8670 @ RHC 60
The two on the right are 52100 @RHC 62 (That Jen-Ken kicks butt!).
 
Lorien said:
started grinding at this thing today, (my first forged blade);
7wJLOau.jpg


piwqx4c.jpg
Click to expand...
Nice, its a fun way to make a knife, this is my first attempt this week at a paperweight. (required, so I heard..)
2NxTZXk.jpg
 
My first San Mai project is nearly done. I have been informed that the handle is too chunky so I need to do a bit more shaping there, but very happy with how it is coming out.

This is 15n20 around a1095 core, etched in ferric chloride. Red oak and brass for the handle.

A big thank you to Stacey and everyone that gave me advice. On my first attempt they helped me diagnoseovercome what turned out to be a bad batch of steel.


https://flic.kr/p/2omrrS7
 
So , why we don t use tempered glass for this application .It is much harder and scratch resistant , it is stronger four time then ceramic glass and can take very hard blows , when break it shatters into a thousand pieces. ....... ?
 
Natlek said:
So , why we don t use tempered glass for this application .It is much harder and scratch resistant , it is stronger four time then ceramic glass and can take very hard blows , when break it shatters into a thousand pieces. ....... ?
Click to expand...

I agree. I haven't been able to source it at the right size and reasonably priced. One of my suppliers has the pyroceram, and at a good price so
 
Natlek said:
So , why we don t use tempered glass for this application .It is much harder and scratch resistant , it is stronger four time then ceramic glass and can take very hard blows , when break it shatters into a thousand pieces. ....... ?
Click to expand...
Because pyroceramic materials can handle roughly 3x the constant heat load of tempered glass and can withstand much higher transfer rates for those high temperatures. I also don’t see shattering into thousands of potential projectiles (unable to be even partially contained by a shelf) as a benefit for grinding applications.
 
Just to clarify about a glass platen:
A "glass" platen for a grinder is pyroceramic glass. It can withstand around 1500°F without breaking. It is very hard (Rockwell 60) and strong when glued to a solid backing plate. It is designed for high heat situations like fireplace doors. The main reason for using it on a grinder is it is very flat, cheap, and readily available. I hear people say they wear it down fast. I have only ever replaced a pyroceramic platen when I broke it by setting the arm down on the floor too hard. I never saw any wear on the surface otherwise.

Tempered glass is designed for windows and entry doors to resist impact. When the impact is greater than its yield strength (about 3 times the IMPACT resistance over pyroceramic) it is designed to shatter into thousands of 1/4"/6mm pieces with no sharp points. It isn't harder, just tougher than pyroceramic glass.

Since a glass lined platen should not be receiving impact, that is a moot point. What a platen does receive is considerable heat. Tempered glass would be very inadequate for many of us who do hogging of blades.
 
Stacy E. Apelt - Bladesmith said:
Just to clarify about a glass platen:
A "glass" platen for a grinder is pyroceramic glass. It can withstand around 1500°F without breaking. It is very hard (Rockwell 60) and strong when glued to a solid backing plate. It is designed for high heat situations like fireplace doors. The main reason for using it on a grinder is it is very flat, cheap, and readily available. I hear people say they wear it down fast. I have only ever replaced a pyroceramic platen when I broke it by setting the arm down on the floor too hard. I never saw any wear on the surface otherwise.

Tempered glass is designed for windows and entry doors to resist impact. When the impact is greater than its yield strength (about 3 times the IMPACT resistance over pyroceramic) it is designed to shatter into thousands of 1/4"/6mm pieces with no sharp points. It isn't harder, just tougher than pyroceramic glass.

Since a glass lined platen should not be receiving impact, that is a moot point. What a platen does receive is considerable heat. Tempered glass would be very inadequate for many of us who do hogging of blades.
Click to expand...
Good info Stacy, thanks for that. I use pyroceram but on mine but I think since I wet grind it's a little harder on it... I periodically (every 3 months or so) lap it flat again on a diamond plate and replace it every year or so. But that's hundreds of blades by that point. And I'm using some high pressure when grinding under flood coolant with a moen jig (since angles are locked)
 
You must log in or register to reply here.
Back
Top