reaming of square tube
reaming of square tube
(OP)
Hi All,
I need to ream / hone or grind about a mm from the inside of a 75 x 5 shs. All ideas appreciated
I need to ream / hone or grind about a mm from the inside of a 75 x 5 shs. All ideas appreciated





RE: reaming of square tube
RE: reaming of square tube
RE: reaming of square tube
For which purpose, you could make up some sort of square wedge expander.
Or just fill the portion you want to expand with water, and freeze the assembly.
Mike Halloran
Pembroke Pines, FL, USA
RE: reaming of square tube
RE: reaming of square tube
RE: reaming of square tube
RE: reaming of square tube
Or as Mike first suggested, expand the end of the 75 x 75 tube, and then machine the outer surface back to size.
RE: reaming of square tube
Heating the tube a section at a time?
Taking the 1 mm from the outside of the inner tube?
Patricia Lougheed
******
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: reaming of square tube
It would be easier to make the outside of the male tube smaller than the inside of the female tube bigger.
RE: reaming of square tube
So, 1st choice > reduce the 65 x 65 tube.
2nd > Fabricate a new tube using suitably sized plates or channels.
3rd > Cut the 75 x 75 tube in half (length wise), mill the insides to suit, weld the two halves together.
RE: reaming of square tube
RE: reaming of square tube
chem milling of the inside seems to be the best idea
there is vendors who specialize in this work.
do not try this your self since working with acid take special safety handling procedures & equipment.
next time it is possible to make the exact square tubing
by using sheet metal formed & welded, welds planished & draw formed (draw bar) to the exact size needed then the end cap welded by a tubing mfg.
MfgEngGear
RE: reaming of square tube
Cheers
RE: reaming of square tube
RE: reaming of square tube
Some sort of electrolytic approach might be possible, i.e., a 1.3-m long electrode that can do one side at a time with electrolyte flowing in the small gap between the electrode and the tube. But that seems absurdly difficult to me; the cost of doing something like would be high.
I fail to see why you can mill the OD of the insert. That would be a 10x easier task.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: reaming of square tube
RE: reaming of square tube
RE: reaming of square tube
B.E.
RE: reaming of square tube
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: reaming of square tube
I think the clearance to allow assembly may need to > 1 mm.
If the fabrication and assembly included welding, the outer tube is probably less straight than it was, and some grades are allow to be bowed more than a mm in a 3 foot length
htt
In air or hydraulic cylnders To overcome bent components or distortion At some point sliding is best accomplished by a snug fitting piston of limited length at the end of the slider, and a snug fitting section at the start of the cylnder.
http://c
I think an iron butterfly with carbide wings, or wings made from sections of mill bastard files could be attached to a ramrod, and stroked several thousand times by the design engineer while he is watching TV at home, in a process similar to the one shown here.
http://
RE: reaming of square tube
If the actual problem is that disassembly is unthinkable, then designing a custom process is the Holmesian solution.
Shapers have always been the bastard children of the machining world, but they have a time and a place. The advantage is that the way they control the dimensions is the same as the required function.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: reaming of square tube
Tmoose idea sounds appealing given your situation.
You'll want a vacuum with a long hose too to make sure and suck the swarf out of the bottom.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: reaming of square tube
Why?
Is there any practical reason for this demand? Concur with previous: remove the outside of the inside tube steel. (A shaper cannot maintain that good an accuracy down the inside of a 1300 mm tube.)
Acid etching an "equal" amount from all sides of the outer tube seems very risky - One section will always go deeper than the "average" - and to slide, "all sections" must become deeper than the minimum. So many parts will be too deep.
RE: reaming of square tube
If the tube was off and open ended there are several ways to enlarge the ID, like hydroform, expand on a draw bench, or machine on an old fashioned planner mill.
Sunnen has a square bore honing system, but the stroke is limited to 16".
I don't believe that acid etching to reduce the wall would work without a large circulation setup to mitigate some of the problems mentioned above. When I use to reduce car body thickness we had a vat with 2000 gals of acid and it was very tricky. We lost about 25% of the bodies we tried to thin down.
ECM would also take a very elaborate setup and one heck of power supply.
RE: reaming of square tube
it's not pratical to rework/repair the square tube assembled.
I like the Idea of expanding too.
RE: reaming of square tube
http://ww
RE: reaming of square tube
having foreign particles contaminate every thing is not good
thats why I recomended remove & replace.
RE: reaming of square tube
That's why alternatives are being suggested.
As you state, we know very little to nothing about this mechanism, so contamination may or may not be a problem. Either way, contamination could possibly be minimised (or totally mitigated) with judicious placement of coverings and deflectors.
RE: reaming of square tube
I looked Abrasive Flow Machining (AFM) but it is too much metal to remove.
I also looked at electrolytic grinding and again the ammount of metal that needs to be removed precludes a simple setup.
I would like to ask the OP if the problem of removing metal from the inner tube is strength consideration or keep everything the same type problem. If it's a strength problem the inside tub could be reinforced. If it's the other there is a problem.
RE: reaming of square tube
sorry about that.
What I was trying to say like uncle said any type of machining or chemical would be not practical.
even if blasting was sucessfull it would distort the part.
to even get close it will probably need to be power sanded
and hope for the best.
1 mm material is a lot of material.
RE: reaming of square tube