Paramilitary 2: Repairing a Broken Tip

[Ken44]

I have a paramilitary 2 as well - I didn't know S30 was ''that'' brittle - I knew it was, but I'm surprised it broke after being dropped on carpet.

It's not "that" brittle at all.

The carpet didn't do it, but the concrete slab under the carpet. Or at least I assume his place was built on a slab instead of a crawl space with wood floors.

[chipdouglas]

It's not "that" brittle at all.

The carpet didn't do it, but the concrete slab under the carpet. Or at least I assume his place was built on a slab instead of a crawl space with wood floors.

I hope it was - there's a good chance there was a slab under the carpet like you wrote.

[thofmann]

Yes, there’s a concrete slab under the carpet and padding. I’m sure it’s the fault of the concrete slab and not the S30V.

[Mick]

A Dremel tool wil do the job but a 1x30 belt sander does it easier and faster - I've fixed a lot of broken knife tip with a $ 39.95 Harbor Freight belt sander.

[ChapmanPreferred]

I would also remove material from the spine of the blade to touch up your slightly chipped tip. I've "retipped" lots of knives because I like buying knives that are damaged. I've used everything from Leatherman Wave diamond file, sandpaper on a bench, Sharpmaker rods, etc all the way up to a 2"x72" belt grinder to remove the material from the spine of knives with damaged tips. I have tried a variety of tip shapes while repairing damaged knives: reverse americanized tanto, americanized tanto, leaf blade, straight spine up to the Spyderhole... Each knife shape prior to the damage helped me choose the tip shape I decided to apply.

[Evil D]

A Dremel tool wil do the job but a 1x30 belt sander does it easier and faster - I've fixed a lot of broken knife tip with a $ 39.95 Harbor Freight belt sander.

That reminds me I didn't use a Dremel to take the majority of metal off, I used a miniature bench grinder and then used the Dremel to smooth and blend it out. I took off a lot more metal though.

[dbcad]

If, maybe when it happens to me again the choice will be to take the material off of the spine blending as well as you can to the original contour of the spine.

I hope Thofman replies and lets us know how it turned out

[mwong61]

I recently did the exact thing with my Blue Sprint Run M390 Para 2.
At first I didn't notice that I chipped the tip until days later.
I was fortunate that the it only about 3mm of the factory bevel that broke.
My blue para came with a much lower factory bevel then most of the pics I
see. My first thought was to send it in to spydie and have it done
by a pro but the I decided to use my Edge Pro Apex and slowly reprofile
it especially working hard on the chipped area and blending it back in.

Right now I consider it about 98% done right and under a loupe you can still
tell there was damage but to the naked eye it looks just like its supposed to.
I'm very happy with the way it turned out and even more pleased with how
well the M390 responded. I would never have attempted it with the only
the sharp maker even with my diamond hones.

M-

[Bill1170]

I have a paramilitary 2 as well - I didn't know S30 was ''that'' brittle - I knew it was, but I'm surprised it broke after being dropped on carpet.

The tip probably penetrated the carpet and pad and broke when it struck the hard surface underneath them.

[Ken44]

It's not "that" brittle at all.

The carpet didn't do it, but the concrete slab under the carpet. Or at least I assume his place was built on a slab instead of a crawl space with wood floors.

Yes, there’s a concrete slab under the carpet and padding. I’m sure it’s the fault of the concrete slab and not the S30V.

The tip probably penetrated the carpet and pad and broke when it struck the hard surface underneath them.

Look up before posting.


Just kidding with you Bill

[thofmann]

Well, I finally tackled repairing the tip on my PM2 yesterday. I consider myself still a beginner when it comes to sharpening and up to this point haven’t been entirely sure of the best way to sharpen tips. Also, this is my first time of sharpening S30V.

Due to the angle of the chip and the small amount of blade broken off (0.5mm), I decided to grind up toward the spine rather than grind spine down toward the point. I started with the diamond rods I just purchased for my Sharpmaker. Wow! Those thing ate metal off the tip like there was no tomorrow! After a short time I switched to the brown rods to make sure I didn’t overdo it.

Here’s a picture of the finished repair job. The tip is not as fine has the original. When examined with an 8x loupe you can tell it’s not perfect, but still it is very functional. I think the rest will smooth out as the PM2 is sharpened a couple more times. I figure it’s easier to take more metal off later than it will be to put it back on. When compared to my unused CTS-20CP PM2, I lost about 1.0–1.5mm of blade length. I learned a little and I’m happy with the end result. Plus there’s a certain satisfaction in having fixed it myself.

Thanks for all the tips guys!

Thomas

[dbcad]

Congrats Thomas, Looks a a real good job! I know it feels good for you that you were able to handle it Enjoy the Para We'll turn you into an edge nut eventually

[jackknifeh]

That is a very good job. If I saw that picture I'd never suspect the tip had ever been damaged. Great job.

Jack