Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 15 of 16
Thread: Bending metal rod up to 3/4 inch
-
7th Apr 2015, 11:26 AM #1
Bending metal rod up to 3/4 inch
Mucking around on the weekend and experimenting with some holdfasts, it would have been very handy being able to bend some rod that was almost 3/4 inch in diameter. Had access to a pipe bender years ago and that was great for metal tubing and pipes but don't have it anymore. Can you rig up some equipment for a one-off job like this? Don't really want to go down the pipe bender purchase route as would not get value out of it. I'm assuming I must use some heat to help the bend and it's mild steel.
-
7th Apr 2015, 11:48 AM #2Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,182
Making steel hold fasts is not just a matter of bending a piece of steel rod. The end that makes contact with the work must be appropriately flattened which requires a significant source of heat like a forge. I have seen holdfasts made by hand by just grinding a sloped flat surface onto the end of a rod but the surface area is too small and it marks the work so a protective piece needs to be used but even then sometimes the contact area is not large enough so the work moves.
-
8th Apr 2015, 12:37 PM #3
Thanks guys, I don't use holdfasts much but a couple of occasions lately they would have come in useful, not critical that I can bend them as I could always weld a flat onto the holdfast stem, just thought that I could save a bit of time and see whether bending the rod was an option.
-
11th Apr 2015, 07:56 AM #4Senior Member
- Join Date
- Jan 2004
- Location
- Bellingen
- Posts
- 278
Post up some pics when your done!
Like the other post said, try a cheater bar first.
When ever I need to bend up something complicated that's too thick to bend cold, I usually make shallow cuts with a thin cutoff wheel to weaken it. I just weld it up after to strengthen it again.
I don't have an oxy so if I'm hot bending something, I just get a little creative with light weight fire bricks and use a big propane torch. Just the big primus head in the handyman kit.
Mapp gas is even better but bottle gas is cheap.
You can find refactory bricks from pottery supply shops.
Perlite is even cheaper (garden supply) but it's loose and not good for forming walls. It does not last very long either but it works.
-
13th Apr 2015, 11:22 AM #5
Thanks Ben, I've been looking at options to ox-acetylene so your info is timely. I ended up welding some flat bar to some rod for my holdfast. It holds well but I'd like it to release a little easier. Used mild steel, 10 mm flat bar and 19 mm rod, the 10 mm is overkill but I didn't have anything thinner, will put up a pic later.
-
14th Apr 2015, 10:49 AM #6
Here's what I came up with. Holds well, would like it to release a little easier though. Flat bar just welded to rod, didn't have any suitable pipe to bend the rod.
-
14th Apr 2015, 10:56 AM #7Senior Member
- Join Date
- Jan 2004
- Location
- Bellingen
- Posts
- 278
Nice one! Looks like it will do the job quite well. I think I will knock up a few of those.
Look on the bright side, it's better than saying ' I wish it would hold on a little tighter'
I did see a video a while back where the woodworker pulled up on the hold down and smacked down on the bench right next to rod with a wood mallet. The vibration let it come loose....I guess every clamp,bench, hole etc will be different.
Maybe have a little over hang on the back so you can tap it up with a hammer or use the claw to pry it up if it's too close to the bench!
-
14th Apr 2015, 11:49 AM #8Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,182
-
14th Apr 2015, 12:04 PM #9
-
15th Apr 2015, 11:41 AM #10Senior Member
- Join Date
- Jan 2004
- Location
- Bellingen
- Posts
- 278
You got me thinking again Bob! I would have assumed the friction points in the hole would have been the same on a curved or flat hold down? Maybe it's the extra length in the curve that allows for some more spring?
I like the simplicity of tigers clamps though. Every tool you have is going to perform a little differently than someone else's. I think I would just get use to the simpler to make option and play around with some ways of releasing it. Depends on what tools you normally have on your work bench I guess.
Hey tiger, what is your bench made out of and how thick is the top?
-
15th Apr 2015, 12:25 PM #11
Hi again Ben,
My workbench top is approx. 35mm made with a combination of Tas Oak and Pine, basically whatever had lying around. I've got storage underneath so had to make my own holdfasts as the bought ones were too long, also I wasn't sure that the commercial ones were going to work in a narrow width bench like mine but so far so good. The 10 mm bar is probably too thick and reduces the springing ability, if I were to make another one, I'd use something thinner. I think Bob's suggestion may be correct about the curved top, you have more surface area to hit it from behind rather than my design.
-
15th Apr 2015, 12:27 PM #12Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,182
-
15th Apr 2015, 05:59 PM #13
Nice design Sacc.
-
16th Apr 2015, 10:50 AM #14Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
- Posts
- 6,216
When I was at high school in metal work the school had a LPG setup where the air was supplied by an air compressor...
If you really want some heat I once made a diesel air torch, and this was before I had any machine tools..... It would melt aluminium and roared like a rocket..Gold, the colour of choice for the discerning person.
-
17th Apr 2015, 09:42 AM #15Senior Member
- Join Date
- Jan 2004
- Location
- Bellingen
- Posts
- 278
Now you have gone and done it RC! Diesel torch! Can you put up a bit more info mate?
Similar Threads
-
Bending 2 inch gal Pipe.
By Timless Timber in forum METALWORK GENERALReplies: 38Last Post: 20th Sep 2013, 09:31 PM -
Beginner metal-working question re. bending
By wsal in forum METALWORK GENERALReplies: 25Last Post: 20th Oct 2011, 12:00 AM -
SOLD: 6 inch metal working bench vice
By Sanity in forum METALWORK - Machinery, Equipment, MARKETReplies: 4Last Post: 28th Feb 2011, 03:18 PM