Author Topic: Fender repair?  (Read 3316 times)

0 Members and 3 Guests are viewing this topic.

Offline Terry in Australia

  • Really Old Timer ...
  • *******
  • Posts: 33,321
  • So, what do ya wanna talk about today?
Re: Fender repair?
« Reply #25 on: February 21, 2017, 09:34:04 PM »
I don't think a shot bag or a piece leather or anything soft would work that well, folk who build gas tanks and fenders etc use them to roughly shape an item, but they then use an English wheel to sort out the myriad of dents created in the process of shaping the item.

You need a hard surface to tap the dent out, with preferably the same outline as the fender so you can tap the dent into the same profile as the fender. You could bend a piece of flat bar to the same profile as the outer profile of the fender, then carefully tap the dent out from the inside using an aluminium or copper hammer. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline ofreen

  • Old Timer
  • ******
  • Posts: 4,036
Re: Fender repair?
« Reply #26 on: February 21, 2017, 09:53:25 PM »
I made the first beater bag out of an old welding apron and filled it sand. I agree most wouldn't have good results trying to hammer out a dent in a chrome fender. Which is why I suggest working it out with dolly. Working from the outside of the dent in with the bag supporting the piece is a pretty forgiving method on chrome if the metal isn't too stretched.
Greg
'75 CB750F

"I would rather have questions I cannot answer than answers I cannot question." - Dr. Wei-Hock Soon

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 19,983
  • Saver of unloved motorcycles.
Re: Fender repair?
« Reply #27 on: February 21, 2017, 10:22:40 PM »
 My brother got me a body dolly that's close to the radius I need. I spent a few minutes of the belt sander smoothing the edges and removing a little rust. I had a bike to sell and heads, cylinders to pick up today not much time for the fender.
 I do have a heavy canvass bank bag and enough lead shot in my old dragster front weight box to make it work, I always wanted a shot bag to work with. I doubt the chrome can be saved anyway but nothing ventured, etc. I paid $20 for the fender so WTH?
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,058
Re: Fender repair?
« Reply #28 on: February 22, 2017, 06:43:53 PM »
 So if its a 20.00 single cut...practice on something else. A single cut is worth money fixed.
Terry, an english wheel only works on some stuff, if the radius is right, it could work on a fender, but a fender roller has better control.
 The advantage of the bag is it is non scratching, and in most cases will conform to most shapes. Before they had bags, cedar stumps were often used..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline chewbacca5000

  • I polish covers!
  • Old Timer
  • ******
  • Posts: 3,536
Re: Fender repair?
« Reply #29 on: February 22, 2017, 06:49:30 PM »
Take it with you to Harbor Frieght an use their English wheel.  I did this with a gas tank.  Worked great.

Offline Terry in Australia

  • Really Old Timer ...
  • *******
  • Posts: 33,321
  • So, what do ya wanna talk about today?
Re: Fender repair?
« Reply #30 on: February 23, 2017, 01:40:00 AM »
So if its a 20.00 single cut...practice on something else. A single cut is worth money fixed.
Terry, an english wheel only works on some stuff, if the radius is right, it could work on a fender, but a fender roller has better control.
 The advantage of the bag is it is non scratching, and in most cases will conform to most shapes. Before they had bags, cedar stumps were often used..

No worries Frank, I've never seen a fender roller, although I've seen plenty of fenders made on English wheels on "American Choppers" etc. My point about the shotbag is that hitting a piece of metal into a shot bag is a great way to stretch the metal into another shape when you're making your own tank etc, but because this is the purpose of a shotbag, it's really easy to turn a concave dent into a convex bump. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,602
  • Bike almost back to the 70's 2015
Re: Fender repair?
« Reply #31 on: February 23, 2017, 02:43:16 AM »
I could not hold myself from a quick search on english wheel :)
http://www.homemadetools.net/category/english-wheels?sort=title
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 19,983
  • Saver of unloved motorcycles.
Re: Fender repair?
« Reply #32 on: February 23, 2017, 06:14:01 PM »
So if its a 20.00 single cut...practice on something else. A single cut is worth money fixed.
Terry, an english wheel only works on some stuff, if the radius is right, it could work on a fender, but a fender roller has better control.
 The advantage of the bag is it is non scratching, and in most cases will conform to most shapes. Before they had bags, cedar stumps were often used..

 Good point Frank.  I have a perfect practice dent on a K5 fender. I've been fixing cracked head fins today and flushing a dirty gas tank. I'll get to the fender after a couple of the "for sale" projects get done.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.