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Forum topic by bluekingfisher posted 11-22-2011 11:04 AM 1721 views 0 times favorited 18 replies Add to Favorites Watch
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bluekingfisher

1246 posts in 2440 days


11-22-2011 11:04 AM

I’ve had some pipe clamps (heads & tails, non branded) lying about in a box for some time so I thought it about time I bought some conduit pipe for them. The pipe here in the UK is 25mm , a fraction under an inch.

The clamp head fits as snug as a bug onto the thread of the pipe but the bore of the cams on the tail peice is slightly to big for the pipe and doesn’t hold or grab the clamp meaning it slips even when I engage the cams fully.

I know the clamp heads and tails were designed for inch pipe but I would have thought the small descrepency would not affect the cams on the tail peice? I have some Pony pipe clamps too, I noticed with them there are little tightly wound springs ( a bit like key fob circlips) which fit inside the tail stiock peice of the clamp to assit in gripping the pipe, perhaps this is to counter the change in pipe size.

Strange the head should fit so well and the tail not to well.

Has anyone experienced this dilema and have they found a way to rectify it.

Thanks in advance.

David

-- No one plans to fail, they just, just fail to plan


18 replies so far

View TopamaxSurvivor's profile

TopamaxSurvivor

17654 posts in 3136 days


#1 posted 11-22-2011 03:33 PM

NO, but a cheap fix is probably a brass shim. Brass grabs steel ;-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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bluekingfisher

1246 posts in 2440 days


#2 posted 11-22-2011 03:47 PM

Thanks Bob, you are right, overlooked that point, anything in mind regards what could be used as a shim in this case?

-- No one plans to fail, they just, just fail to plan

View crank49's profile

crank49

3980 posts in 2432 days


#3 posted 11-22-2011 03:49 PM

The pipe clamps are probably made for 3/4” pipe, which has a nominal O.D. of 1.050” which is 26.67mm .
So, your pipe @ 25mm is 1.67mm undersize.

Maybe you could sell the clamps to someone with access to inch pipe on Ebay or maybe find someone with some 3/4” pipe for sale.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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bluekingfisher

1246 posts in 2440 days


#4 posted 11-22-2011 03:52 PM

Thanks Crank, why then does the threaded head peice fit like a glove then??

-- No one plans to fail, they just, just fail to plan

View TopamaxSurvivor's profile

TopamaxSurvivor

17654 posts in 3136 days


#5 posted 11-22-2011 04:12 PM

Brass sheet of appropriate thickness.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Bluepine38's profile

Bluepine38

3341 posts in 2546 days


#6 posted 11-22-2011 04:27 PM

You said you used conduit pipe, which is not sized quite the same on the outside and regular pipe even
though the threads are the same. I think (using the term loosely) that the clamps were made for either
black or galvanized pipe and would work properly with the correct pipe.

-- As ever, Gus-the 77 yr young apprentice carpenter

View Bill White's profile

Bill White

4449 posts in 3421 days


#7 posted 11-22-2011 04:59 PM

Ummmmm? Is the pipe galvanized? Those clamps won’t work well on gal. pipe. Black pipe won’t slip as bad. Wanna know how I found out? Wanna buy some galvanized pipe?
I’ve switched to plain ol’ black gas pipe. Solved the problem.
Bill

-- bill@magraphics.us

View Lee Barker's profile

Lee Barker

2170 posts in 2311 days


#8 posted 11-22-2011 05:12 PM

I’m assuming “cams” refers to the three washer-like discs with a tab on them.

Are the tails well used? Cheap clamps have cheap cams and they can lose their edge and not bite.

The fix over time is to flip them over. In any event, I would see about swapping out the cams from your Jorgensons just to see if you can isolate the problem.

I would think slightly undersize pipe would allow the cams a better biting angle so they would actually work better.

This is a fun problem to ponder. Thanks for bringing it up!

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View Lifesaver2000's profile

Lifesaver2000

543 posts in 2573 days


#9 posted 11-22-2011 05:16 PM

In reference to why the threaded end of the pipe fits while the other end doesn’t:

Iron Pipe Thread is tapered, so as long as the threads per inch are the same, then a slight difference in diameter may not be noticeable, except that the thread will screw in a bit deeper before it gets tight.

As I type this, I have to wonder why a metric sized pipe would have a thread count that is compatible with an Imperial sized fitting, but that would be a different topic. or different “thread”

View Rick  Dennington's profile

Rick Dennington

5173 posts in 2655 days


#10 posted 11-22-2011 05:17 PM

Mornin’ mate,

That’s what you get for living so far away from all of us…..lol. The standard sizes that we have pretty much in the U.S. is either 1/2” or 3/4” galvanized as stated by Gus and Bill. Some prefer the black pipe, but I like the other best. You have to watch when you use the black, as it has a tendency to stain the wood and leave black on it…..I have both kinds…....Want to buy some…? :)

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View TopamaxSurvivor's profile

TopamaxSurvivor

17654 posts in 3136 days


#11 posted 11-22-2011 05:55 PM

I use my scrap conduit. No problems here ;-))

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Sawkerf's profile

Sawkerf

1730 posts in 2529 days


#12 posted 11-22-2011 06:06 PM

I’ve used old galvy pipe from repipe jobs for years with no problems – except for the time I “cleaned” a piece of pipe and the locking tabs wouldn’t grab. – lol

-- Adversity doesn't build character...................it reveals it.

View crank49's profile

crank49

3980 posts in 2432 days


#13 posted 11-22-2011 08:24 PM

About the pipe thread fit issue.

You said you had metric pipe (or conduit) and I assumed you knew what you had.

I think in the UK the pipe threads are straight, while in the USA the pipe threads are taperd.
True, the BPT, British pipe thread?, will screw on farther than the tapered threads, but I thought it was due to the lack of taper, not because of undersize. They need O-rings or sealant to work for pressure sealing.

Come to think of it, I was once told that all pipe is inch based, even in Europe. If it’s metric, it’s called tubing, not pipe. I have installed equipment from Europe with pipe on it that would screw onto our pipe fittings; except for the straight vs taper issue and needing sealant, they work. Their fitting are totally different in design and shape. Ours look much heavier and thicker.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View bluekingfisher's profile

bluekingfisher

1246 posts in 2440 days


#14 posted 11-23-2011 10:28 AM

Thanks for all the responses fellahs – The pipe is galvanised, never thought to look at the taper on the thread end of the pipe. Thankfully I only bough tthe one lenght so no huge outlay for a pipe that isn’t compatable with the clamp heads.

Here in the UK we used the english imperial version of measurememt until the 1970-8o’s when we then had to fall into line with the Euro zone with their metric system, (don’t you just love politicians?) many of us resisted the changes but alas over time everything from weight to distance has gone metric although road signage is still in miles as are the speedos in our vehicles – I digress.

I may have to root around in scrap yards if I want some old inch pipe, either that or as someone suggested, flog em on ebay to someone with the imperial sized pipe.

Rick, your right…........too far away mate, and that old iron would cost an arm and a leg to ship Lol

Thanks again all.

David

-- No one plans to fail, they just, just fail to plan

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bluekingfisher

1246 posts in 2440 days


#15 posted 11-23-2011 10:31 AM

Hi Lee – yep the cams are the three discs your mention. As mentioned the pipe is shiny galvanised. Perhaps the more coarse skin of black pipe would help a little.

I may have to find a plumber, see if he has some scrap stuff before I buy.

Thanks again.

David

-- No one plans to fail, they just, just fail to plan

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