Belzona Shaft Repair

[nova_robotics]

This just popped up on Youtube. Is there anyone that would actually trust this repair?

[Frank S]

We used to buy Belzona in bulk to fill in the voids on sleeve bearing locations after we had welded them up and ground as best as could be when it just wasn't feasibly to set up my boring bar. We also used it to repair the cross shafts the track groups pivoted on for D9Ls and D10s It actually holds up quite well when you just can't afford to have a machine down long enough to do a proper repair. Might give you another couple thousand hours of service enough to get you through the season sometimes.
I even used it on a worn camshaft drive end in a Ford 352 the guy drove the truck for three years after the repair.

[mdhatter3]

Is this JB weld ? It sure looks like it may be.

[imohtep56]

Here is more info: https://blog.belzona.com/solutions-f...manufacturing/

IMO, it looks more like industrial bondo. They mention that it is for "emergency' repair or where other repair modalities are not feaslible.
I would rather have the shaft flame-sprayed...

[hemmjo]

I have used JB weld for some application. I would not do it in life threatening situations. All were for low speed application; spindle repairs where the bushings wore out and damaged the spindle, mower deck spindle shafts, things like that I see no problem.

https://www.belzona.com/assets/data/...al-repairs.pdf

[Frank S]

Belzona is kind of a JB weld on steroids product. But just like any other epoxy-based product, there are suitable applications and those which should be avoided at all costs. The same goes for flame spray, which has a critical application temperature a minimum and maximum repair thickness, Flame spray as in oxy fuel and powder is only one of several types of metalizing build up Technologies has advanced since I had my powder spray torch, mine was a Eutectic torch I could use either the Eutectic powder or the Stoody brand. If you think it is bad news to use a grinder on parts in a lathe think about the horrors of having molten powder sprayed on a rotating part. With all surfaces covered you can still turn a $20,000.00 dollar lathe into scrap metal in under 5 minutes.

[IntheGroove]

The slower, better way, is to have the part hard chromed then machined...