zinc annode grinding

[Spiritofcuttysark]

Newly purchase older boat with 1" shaft. Need to reduce shaft collar zinc annode profile size by 4mm each side. Should this be done on lathe or other suggestions?

[CalebD]

Ok, I'll admit it. I usually grind down a 1" collar zinc for our shaft about once every 2 years, as needed. We only have a clearance of around 1/2" between the prop and the cutlass bearing on our old Tartan 27.
I looked into the 'drive savers' but since zincs are cheaper I keep grinding them down with: a grinding wheel, a 4-1/2" grinder and breathe zinc dust now and then.
Not much fun and there has to be a better way.

[Fstbttms]

Originally Posted by Spiritofcuttysark

Newly purchase older boat with 1" shaft. Need to reduce shaft collar zinc annode profile size by 4mm each side. Should this be done on lathe or other suggestions?

What is the width of clear shaft you are dealing with?

[MARC2012]

Are you using an egg or a donut?marc

[scottyt]

I have a small metal lathe, if some one needs to they can send me a few zincs and tell me how small they need them. i will turn them down to what ever size they need.

just pay shipping both ways.

[sailingdog]

You could also just grind them down a bit with a belt sander.

[mitiempo]

Or cut them in half to make 2.

[sailingdog]

Originally Posted by mitiempo

Or cut them in half to make 2.

Depends on whether it has four bolts holding it together or just two... if it has four, then that would work, if just two, probably not going be worth doing.

[mitiempo]

True

[Fstbttms]

Originally Posted by sailingdog

Depends on whether it has four bolts holding it together or just two... if it has four, then that would work, if just two, probably not going be worth doing.

1" shaft zincs do not have 4 screws, regardless of brand, so this is a moot point.

I have used a hacksaw to shave zincs and more recently, a portable band saw. That makes quick work of the job.