It's called the neutral axis. This is where the compressive and tension balances in the material section. The compressive strength is higher than the tensile strength, so the neutral axis is not in the center, but is anywhere from 35% to 48% of the thickness. In sheet metal they use bend deduction or bend allowance to calculate the position of the radius. In precision metal stamping, it is normally done by calculations backed by actual bend data. After active duty, I went into the stamping and injection molding industry as a mechanical engineer. We had to hold extreme precision on bends and their angles. There is also spring-back so the inside bend radius and angle is smaller than the outside. This is very difficult to predict as the material strengths can make a huge difference. Both the chemistry and heat treatment of the raw material has a tolerance just as the physical dimensions that affect the bending. Robert S BSME
You made it simple at 1:40 when you did a Hand Gesture, showing how your Thumbs get closer together, and your fingers get further apart. That could have been a good part of the lesson, telling people to watch what happens to the distance between the upper and lower sides.
Kevin, you're a great person to ask this. I have some 1" x 3" rectangle tube, 14 gauge, that I want to cut into 6ft sections and bend into an arc shape like a bow..so a long gradual curve over the whole piece with a center apex of ~16". So literally like the shape of a bow and arrow" bow shape. And yes the curve is along the flat 3" side. How can this be done?
A pipe roller with square dies to fit your stock. Going to be VERY hard to do without hydraulics. I would either cut and bend and reweld the stock you have or.... 1 inch stock to roll the top and bottom of the curve and flat sheet to cut and weld the front and back on. You could try filling the stock with wet sand and capping both ends, then heat and roll or bend but I have never had any luck doing that.
.Hey Kevin..........where did you purchase the square tubing dies from? Do they come in different sizes as well? I would like to purchase some different size ties for tubing as well. Please Advise Thanks, Jim
Hi Kevin, You know that you really don't want me to hit the subscribe button. If I did I would loose your video notification. So I am not going to hit is because I want to keep watching your videos. Now for a question. Is it time for a new electrode when the plasma torch starts sounding like a Jiffy Pop pan heating up? It did look a tad bit eroded. Thanks for the info and fun stuff you share.
@@KevincaronSculpture thank you sir I want to get back to welding I have some ideas in mind. I enjoy your channel! When I started welding I referred back to your videos and that’s a big part of how I learned!!
Hi there, thanks for the video, if I need to curve a 1”x1” 16ga mild steel tube but the full length is 25’ and the max bend in middle is maybe 9” pushed out compared to a straight line. Do I still need a tube roller or is there a simpler way? Just need to make 8 PCs. Thanks in advance
Hey Kermit, I was watching the video and my GF was listening and asked if that was Kermit the frog? The more I listened the more you sounded like Kermit but definitely that wasn’t miss piggy asking questions, but I mean no disrespect, and thank you for your great videos
The pipe is bending in the middle is a great tip. I wasn't thinking of it that way and it cleared up a lot. Thanks for sharing.
Glad it was helpful!
So glad your business is keeping you busy, thank you so much for the time and energy in sharing your information.
It's called the neutral axis. This is where the compressive and tension balances in the material section. The compressive strength is higher than the tensile strength, so the neutral axis is not in the center, but is anywhere from 35% to 48% of the thickness. In sheet metal they use bend deduction or bend allowance to calculate the position of the radius. In precision metal stamping, it is normally done by calculations backed by actual bend data.
After active duty, I went into the stamping and injection molding industry as a mechanical engineer. We had to hold extreme precision on bends and their angles. There is also spring-back so the inside bend radius and angle is smaller than the outside. This is very difficult to predict as the material strengths can make a huge difference. Both the chemistry and heat treatment of the raw material has a tolerance just as the physical dimensions that affect the bending.
Robert S
BSME
Interesting! Thank you for watching and posting.
You crack me up Kevin! Great explanation as always and in simple language too. Keep up the good work and thanks.
Great Kevin, thanks for your tips from the UK
Thanks for watching Keith!
I love it when Kermit gets busy in the worksop.
Oh yeah! Just about every day of the week.
You made it simple at 1:40 when you did a Hand Gesture, showing how your Thumbs get closer together, and your fingers get further apart. That could have been a good part of the lesson, telling people to watch what happens to the distance between the upper and lower sides.
Damn, and I missed it! Thank you for watching and posting.
Ok, I’m developing a theory that Kevin is ALSO This Old Tony. #ChangeMyMind
Thanks guy!
Looks like your on a roll !!!
Kevin, you're a great person to ask this. I have some 1" x 3" rectangle tube, 14 gauge, that I want to cut into 6ft sections and bend into an arc shape like a bow..so a long gradual curve over the whole piece with a center apex of ~16". So literally like the shape of a bow and arrow" bow shape. And yes the curve is along the flat 3" side. How can this be done?
A pipe roller with square dies to fit your stock. Going to be VERY hard to do without hydraulics. I would either cut and bend and reweld the stock you have or.... 1 inch stock to roll the top and bottom of the curve and flat sheet to cut and weld the front and back on. You could try filling the stock with wet sand and capping both ends, then heat and roll or bend but I have never had any luck doing that.
Where do you get the square tube die for the harbor freight tool pipe bender?
swagoffroad.com
Hey Kevin, as always awesome video
Thanks for watching and posting James!
.Hey Kevin..........where did you purchase the square tubing dies from? Do they come in different sizes as well? I would like to purchase some different size ties for tubing as well. Please Advise
Thanks, Jim
I just searched for square tubing dies for harbor freight bender. Lots to choose from.
Be nice if they made an affordable mandrel bending machine. You can only bend slightly on these kinds of benders. Thanks for the video!
Have to get a mandrel bender some day. Thanks for watching.
Kevin, can you comment on the filling the tube with fine sand method? I've never tried it.
Thanks for sharing,
Cheers
I have tried that and could never get it to work right.
Hi Kevin, You know that you really don't want me to hit the subscribe button. If I did I would loose your video notification. So I am not going to hit is because
I want to keep watching your videos.
Now for a question. Is it time for a new electrode when the plasma torch starts sounding like a Jiffy Pop pan heating up? It did look a tad bit eroded.
Thanks for the info and fun stuff you share.
Yeah, when it spits or cuts sideways it is time for a new set!
@@KevincaronSculpture Yep, It cuts much better now. Thank You
Ok I found the machine where do you get the square roller baring
Search for "Swag off Road Dies" and you will find them.
@@KevincaronSculpture thank you sir I want to get back to welding I have some ideas in mind. I enjoy your channel! When I started welding I referred back to your videos and that’s a big part of how I learned!!
Magic wand! LOL!!!!
Pretty cool tool. I'm assuming harbor freight has the square tube roller as well?
Where did you get the square tube dies? Harbor freight didn’t have any. The bender only comes with round tube bending dies.
Got my question answered in a below comment… he just googles square dies for harbor freight bender.
Where you got the square dices from?
If I remember correctly, I got the square dies from Swag offroad.com
Where can I get one of those machines
He said his is from Harbor Freight. And he got the dies for bending square tubes at swag offroad dies.
I looked at harbor freight for the bender you have. It says round pipe bender. Do you have to change the dies for square tubing?
Yes you do have to change the dies for square tubing. They are available online.
Hi there, thanks for the video, if I need to curve a 1”x1” 16ga mild steel tube but the full length is 25’ and the max bend in middle is maybe 9” pushed out compared to a straight line. Do I still need a tube roller or is there a simpler way? Just need to make 8 PCs. Thanks in advance
Sorry but you will need a tube roller for this job.
Hey Kermit, I was watching the video and my GF was listening and asked if that was Kermit the frog? The more I listened the more you sounded like Kermit but definitely that wasn’t miss piggy asking questions, but I mean no disrespect, and thank you for your great videos
Thank you I guess. Better to sound like Kermit then look like Miss Piggy I guess.
does this rolling tire produce enough force to push tube forward doesnt it slip ?
No slipping at all. You just have to go slow and let the rollers do their job. Thank you for posting.
Do you think that this would and could bend 3/8 or maybe smaller rebar in a 4 foot diameter circle?
It mIght take a while but it should.
Where did you get the square dies for the harbor freight roller?
Online at swag tools.
Where did you get the square tubing rollers
Amazon of course, www.amazon.com/SWAG-Tubing-Roller-Compatible-Freight/dp/B00LBFQ2A0?th=1
Did you buy those rollers, or did you make them?
Bought them online. Swag offroad through Amazon.
I want to bend and cut 38 x 38 x 3
Okay, so what are you waiting for?!?
Now I just need a pipe roller :)
That's what I said!
Where did you get your dies?
Google!
www.harborfreight.com/3-piece-die-set-66598.html much less $$ then a lathe
👍👍👍
Some how I seen this video before , must of been same tool round stock
Try it by going 90 degrees!👆😬
Now my head hurts!
@@KevincaronSculpture 🤣👌
Only problem I can hear you clearly but can't see much what you are doing
I will have a talk with the person behind the camera.
John Goodman
I would've liked your video but it would've ruined the 666 sorry :(
Where did you find the square dies at
Over here.. www.amazon.com/SWAG-Tubing-Roller-Compatible-Freight/dp/B00LBFQ2A0
Thanks