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Fixing Pitted or Chewed Dropouts  RSS Feed

#1 2016-01-30 3:58pm

Shotgun
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From: Tortugas Pines
Registered: 2014-03-09
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Fixing Pitted or Chewed Dropouts

First off, if you don't have anything nice to say, move along. I am sick of the keyboard experts telling me what I can and cannot do. I fabricate and weld for a living. This is how I fix pitted or chewed up drop outs.these are the drop outs on my '81 Team Mongoose. On top of being really pitted, there was some axle nut marks that needed to be fixed. I first sandblasted the entire frame especially the pitted drop outs because rust would inhibit the process. I use my MIG welder because you can make a series of tack welds that will cover the damage. This is one place where a MIG welder shines, as it does not concentrate a lot of heat in one place which can warp the thin drop out.I then take a 36 grit sanding disc and carefully grind the welds flat. I then move on to 80 grit and finally a flap disc for the final finish. If there are more pits or damage, simply add some more tack welds until you are done. This is the process I use to repair pitted car chassis, motorcycle parts and vintage race cars that I restore.

http://uploads.bmxmuseum.com/user-images/207817/image56ad4ddf6c.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4de434.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4de494.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4de5ce.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4de624.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4de656.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4dea5c.jpeg
http://uploads.bmxmuseum.com/user-images/207817/image56ad4dea8d.jpeg

Last edited by Shotgun (2016-01-30 4:10pm)

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#2 2016-01-30 4:10pm

stevemilz
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From: Michigan
Registered: 2013-06-11
Posts: 215

Re: Fixing Pitted or Chewed Dropouts

Looks good!

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#3 2016-01-30 5:00pm

vintagebmx1977
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From: Pittsburgh Pa
Registered: 2012-08-21
Posts: 1349
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Re: Fixing Pitted or Chewed Dropouts

stevemilz wrote:

Looks good!

+1


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#4 2016-01-30 7:43pm

skdevore
Pro MemberIt's Not For Sale, Francis!
From: Claremont, CA
Registered: 2010-04-30
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Re: Fixing Pitted or Chewed Dropouts

Well done.


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#5 2016-01-30 7:48pm

norelk98
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From: Chicago, Il
Registered: 2012-10-24
Posts: 1315
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Re: Fixing Pitted or Chewed Dropouts

Crappy job for a welder! lollol


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#6 2016-01-30 8:19pm

leghound79
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From: Mequon, WI
Registered: 2010-02-27
Posts: 2670
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Re: Fixing Pitted or Chewed Dropouts

norelk98 wrote:

Crappy job for a welder! lollol

He said move along, if you don't have anything nice to say!lol


"I've got a smile on my face, and you didn't put it there!"

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#7 2016-01-30 8:59pm

BritUS
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From: Maine
Registered: 2011-04-18
Posts: 1495
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Re: Fixing Pitted or Chewed Dropouts

Those drop outs look good but do you have any pictures of them before you started welding them up?

Oh and can I send you a DB frame that needs some love?

Last edited by BritUS (2016-01-30 9:01pm)


The true measure of a mans worth, is what he would do if he knew he would never be caught.

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#8 2016-01-31 5:44am

Shotgun
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From: Tortugas Pines
Registered: 2014-03-09
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Re: Fixing Pitted or Chewed Dropouts

BritUS wrote:

Those drop outs look good but do you have any pictures of them before you started welding them up?

Oh and can I send you a DB frame that needs some love?

Look at the last picture, for some reason the pictures loaded backwards. What does the DB need?

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#9 2016-01-31 5:54am

Shotgun
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From: Tortugas Pines
Registered: 2014-03-09
Posts: 1151
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Re: Fixing Pitted or Chewed Dropouts

Here is a before shot:
http://uploads.bmxmuseum.com/user-images/207817/image56ae11e7ab.jpeg

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#10 2016-01-31 7:02am

tdarby
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From: Northern, NJ
Registered: 2012-02-14
Posts: 986

Re: Fixing Pitted or Chewed Dropouts

Nice work

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#11 2016-01-31 10:47am

macaltec
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From: North Carolina
Registered: 2007-08-02
Posts: 1447
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Re: Fixing Pitted or Chewed Dropouts

Those sanding discs are the best for getting a flat smooth finish.


Since I'm here, and you're here, doesn't that make it our time?

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#12 2016-01-31 11:48am

80sbikedude
ModeratorBugs Bunny Bmx'er
From: Tarrant County
Registered: 2006-06-14
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Re: Fixing Pitted or Chewed Dropouts

Awesome job!


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#13 2016-01-31 5:55pm

willy01
Pro Member
From: Brandon, MB. Canada
Registered: 2009-10-22
Posts: 938
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Re: Fixing Pitted or Chewed Dropouts

Looks good..great job!


i'm always online, but I come on the site a few times during the day....

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#14 2016-01-31 5:56pm

BritUS
Pro Member
From: Maine
Registered: 2011-04-18
Posts: 1495
Bikes: 2

Re: Fixing Pitted or Chewed Dropouts

Shotgun wrote:

BritUS wrote:

Those drop outs look good but do you have any pictures of them before you started welding them up?

Oh and can I send you a DB frame that needs some love?

Look at the last picture, for some reason the pictures loaded backwards. What does the DB need?

Sent you a PM with pics. smile


The true measure of a mans worth, is what he would do if he knew he would never be caught.

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#15 2016-02-01 7:36am

NOPOSERS
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From: Bellflower, CA
Registered: 2009-05-12
Posts: 1957
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Re: Fixing Pitted or Chewed Dropouts

Wish I had welding skills. ...nice job


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