Anybody ever sharpened a piranha tooth bar?

[bambam31]

After 10 + years it’s time to sharpen it up. I have an angle grinder. What kind of disc should I use?

 

[North Idaho Wolfman]

A grinding disk.

 

[Runs With Scissors]

I used to use the “El Cheapo” disks until I tried these.




They cut so fast, I was amazed.

I also tried this version, and I liked them as well…..Much better than the “El Cheapos”.

 

[PoTreeBoy]

I used to use the “El Cheapo” disks until I tried these.

View attachment 174317


They cut so fast, I was amazed.

I also tried this version, and I liked them as well…..Much better than the “El Cheapos”.


View attachment 174318

I'd like to see a comparison with these (36 grit). My old HF's are lost somewhere.

 

[Motion]

Consider a die grinder with a carbide double cut burr bit.

 

[Russell King]

I would look into 3M Cubitron II discs or sanding discs for welding and metal work. The sanding discs need a backing pad but come in various grit levels and can be used to remove excess weld on fabrications.

https://www.3m.com/3M/en_US/p/c/abrasives/discs/b/cubitron/i/manufacturing/metalworking/

 

[Bee-Positive]

I don't do a lot of metal grinding so I just get a 10-pack from HF for $17.
At less than $2 / disk I don't mind blowing through a few on a job or two.

 

[BruceMc]

I've done mine a couple of times with your basic flap disc. Start on the bottom, then hit the top. Don't grind it too shallow or it won't hold an edge for long.

 

[fmgsr]

Make sure you don't grind to much at a time,
and keep it cool, you don't want to change it's hardness.