Bending Tubing

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Rick D

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Jun 14, 2008
7,204
Hunter Legend 40.5 Shoreline Marina Long Beach CA
So, I have a bimini frame that is a PITA in that I have to unpin it and swing it forward every time I want access to my aft cockpit wing lockers. I've put up with it for eleven years, but now it's time for a modification. After calling four stainless steel guys in the last few years, none of whom ever called back or showed up, I decided to DYI. I got a tube cutter and a 1" mild steel tube to make a template for an S bend. Then I found out I couldn't rent a tube bender, so I got one at ACE for forty-ish dollars. My wife and I determined the general shape and I bent it. I overdid one and made another.

I measured the length I would lose on each leg after the bend (2 3/4 inches), so I got some 1" and 7/8" stainless used stock and made two sleeved extensions. Everything seemed to work out well, until:

I then went to bend the stainless. Well, that was way harder than the tubing I used for the template. After the first bend, I found it had kinked instead of following the die form. So, I cut off the bimini legs and sleeved them back in until I have two new legs made to spec with the S bend. It's a lot easier to get done when you take the stuff in to a shop rather than getting them out to you.

So, I learned seamless one inch stainless requires a lot more power than a store brought bender is likely to give. The unit at the shop is hydraulic. Second, after going through three cutting wheels, I figured stainless cutting is only good for two cuts before replacing the wheel.

Finally, I learned not everything can be DYI and I should have just kept on calling to get someone out. But, now I have a nifty new tube cutter and bender.... that I'll probably never use again.
 
Jun 2, 2004
5,802
Hunter 37-cutter, '79 41 23' 30"N 82 33' 20"W--------Huron, OH
Sorry Rick, but I got a good chuckle out of that. Probably because like most guys here, "been there, done that".
 

Ross

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Jun 15, 2004
14,693
Islander/Wayfairer 30 sail number 25 Perryville,Md.
The difference between the pros and the DYI's is the quality of their tools.
 

John

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Jun 3, 2006
803
Catalina 36mkII Alameda CA
Craig's list

But, now I have a nifty new tube cutter and bender.... that I'll probably never use again.
If you really don't think you'll use them, sell them on Craig's List.
 

Ross

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Jun 15, 2004
14,693
Islander/Wayfairer 30 sail number 25 Perryville,Md.
Re: Craig's list

Never sell your tools!!! I have a set of metric taps and dies. They cost me about 25 dollars. I have used them about 6 times in twenty years. If I had hired someone to do the same work it would have cost me far more than the 25 bucks.
 

Rick D

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Jun 14, 2008
7,204
Hunter Legend 40.5 Shoreline Marina Long Beach CA
I'd heard that. In fact, a zillion years ago I did just that. However, using a die, I figured no problem. And, filling up about 18' of tubing would have been another PITA, of which I had many in this maniacal pursuit. It was a swamp I should not have been in, at least in this magnitude. I just didn't have the proper tools (although I thought I did) and I underestimated the strength of the stainless, having always read of how soft it was.
 
Sep 25, 2008
615
Morgan 415 Out Island Rogersville, AL
Rick D, it sounds like you have a new skill and tools to barter with other skilled sailors. What goes around comes around. I wish I had a slip next to you.
 

BobM

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Jun 10, 2004
3,269
S2 9.2A Winthrop, MA
I hear you! When I had to drill six holes in my 1" stainless guard to mount a Navpod I tried to do it myself. Stainless proved a royal pain to drill so I called a local machine shop which charged me about $40 to do it. I just had to wait about a month for them to get around to it. Worth every penny.
 
Sep 25, 2008
1,096
CS 30 Toronto
SS isn't hard to drill, just different. You need the right drill (slower speed), Cobalt drill bit would be best. Light pressure and cutting oil. Don't let it smoke. If the cut forms a continuous spiral that's the proper pressure. When it make high pitch sound, time to back off and sharpen the bit.

I have done 1/2" diameter by 1/2" thick hole with a hand drill.
 
Oct 26, 2005
2,057
- - Satellite Beach, FL.
SS isn't hard to drill, just different. You need the right drill (slower speed), Cobalt drill bit would be best. Light pressure and cutting oil. Don't let it smoke. If the cut forms a continuous spiral that's the proper pressure. When it make high pitch sound, time to back off and sharpen the bit.

I have done 1/2" diameter by 1/2" thick hole with a hand drill.

Something I discovered when over-sizing the screw holes on my pulpit bases (couldn't get #14 SS machine screws local, had to use 1/4") was that I could place the work in a shallow tub of water (stole the wifes tupperware) the bit stayed nice a cool and no mess with oil. Of course this won't work for large items or things that need to be worked in place. I had a short 2x4 block under the work to keep from drilling thru the tupperware.
 
Nov 20, 2009
10
Catalina 30 Nahant
Lost Arts

In countries where Western tools and techniques are not so available, certain
methods live on. I observed fitters in India installing Stainless tubing. They filled the tube with tamped down fine sand before bending on a makeshift mandrill to avoid kinks.
 
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