What's the best way to cut a mast

Sep 8, 2014
2,551
Catalina 22 Swing Keel San Diego
I have the same boat, same mast, and going to do the same job.

Many good suggestions listed above, various tools listed will all work fine when used properly... except the oscillating tool, I don't think that's a good choice as its too squirrely.

I don't think anyone really said much about 'setting up' your cut. Put the mast on a set of sawhorses or something similar, at least three if not four. With just two it will sag in the middle. One support has to be relatively close to the cut for support. Be as level as possible. It was mentioned above to use tape; yes, yes, YES! Tape it up with blue or plain masking tape and mark you cut all the way around with a sharpie, careful it is square and if your line looks funny then try it again with fresh tape. Secure the mast to the sawhorses with quick clamps or even rope to keep it from moving or bouncing.

The OP pointed out using low tech so there is no need to buy any expensive tools, just a hack saw and a fresh blade, all you really need is a steady hand and follow your line. Cut off wheels on a 4 inch grinder is the next step up but you have to be extremely careful and hopefully have some experience with this tool. that beast can get out of hand (and out of square) quickly if you are not paying attention. A recip saw will work too, but I find that to be less accurate than a hacksaw in this application and likely to get out of hand faster than the cutoff wheel. No matter what you do the cut with use a fine file to clean up after.

I have a Dewalt Chop Saw specifically designed to cut metal (DW 872, carbide blade, NOT the abrasive fiber disc, those deflect like crazy). I'll probably use that saw to make my cut, but at the end of the day it will take way longer to set up that cut, it might just be more efficient to use a hack saw. Anyway, that's a $500 saw so its no something everyone has in their garage. I love it, it can handle just about anything I throw at it. I've cut 2 x 2 x 1/8" angle iron as well as 5/8 Stainless solid rod, straight butter baby!
 
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Jul 22, 2011
146
Mariner Yacht Co.(NH) Mariner 28 Atlantic Highlands, NJ
Maybe its just me, but wouldn't it be easier to build up the holes? I assume you mean the the holes for the bolt that attache the mast to the tabernacle. I'd get some aluminum or even better stainless plate, cut to size of the mast side and put 3 pop rivets on each side. If you are tight for space, you can put the plates inside the mast. Once the mast is raised, that bolt doesn't do anything, it only acts a a hinge when raising and lowering. Again, assuming you are talking about the bolt through the tabernacle/mast holes.
 
Sep 8, 2014
2,551
Catalina 22 Swing Keel San Diego
Not a bad idea, but at the end of the day cutting one inch off the bottom is actually less work than what you mentioned. Stainless would be a bad idea (bi-metal corrosion), unless you isolate. Most of us have a fair bit of that corrosion between the mast and the various stainless hardware because it appears the factory didn't isolate any of these unions.
The hole being all messed up is the primary reason to do this, but usually there are other dings, dents, and general mess that leads to the 1 inch trim off procedure.

Maybe its just me, but wouldn't it be easier to build up the holes? I assume you mean the the holes for the bolt that attache the mast to the tabernacle. I'd get some aluminum or even better stainless plate, cut to size of the mast side and put 3 pop rivets on each side. If you are tight for space, you can put the plates inside the mast. Once the mast is raised, that bolt doesn't do anything, it only acts a a hinge when raising and lowering. Again, assuming you are talking about the bolt through the tabernacle/mast holes.
 
Nov 19, 2011
1,489
MacGregor 26S Hampton, VA
What's the best way to cut a mast you ask?


Sail it under a bridge that lacks about 2 feet of clearance
 
Jun 8, 2004
10,376
-na -NA Anywhere USA
best would be to measure an inch from the bottom and pencil a mark all around that mast vs. tape. Just remember if using a hack saw the finer the teeth the better control with cutting. Better to go slower than fast and screw up.
 
Jan 27, 2008
3,086
ODay 35 Beaufort, NC
Don't forget the edge you cut will no longer be anodized and will corrode quickly. Get some Alodine and apply it to the bare aluminum surfaces following the manufacturers instructions and rinse it off after the appropriate time interval. This provides a "conversion coat" that is corrosion resistant for aluminum when anodizing is impractical. It is used all the time for touching up scratches or repairs in otherwise anodized aluminum surfaces.
 

ppm411

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May 30, 2012
40
1974 Catalina 22 Port Washington, NY
Much success with all of your great feedback. Lots of prep but a perfect cut! Thx for the last tip on alodine. I will find some. Only regret is marking the line with blue tape since it baked on after the cut. Nothing some acetone can't handle. Now on to remounting the mast step with one inch shim.
 

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Nov 19, 2011
1,489
MacGregor 26S Hampton, VA
How did you cut that straight with the saw set to 45 degrees? Just kidding post pics of your 1" shims