The Stovebolt.com Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


WELCOME

The site has expanded to include the 1973 to 1987 trucks!

Check out the new forum just for them and welcome our newest brothers and sisters with the "Rounded Line" trucks.
Encourage one another! Share what you've learned!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
4 members (ASU, 46 Chevy Mom, Christian, Simso), 183 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums58
Topics121,815
Posts982,095
Members44,314
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Finding lows for metal bumping
#1261076 Sun Apr 01 2018 12:39 AM
Joined: Jul 2011
Posts: 705
M
MPandC Offline OP
Shop Shark
We were blocking out the 55 wagon's roof today, and had a few low spots to bump upwards. To locate the lows on the inside, I thought to use one of our rare earth magnets in the center of the low, and use the body hammer on the bottom side of the roof to pinpoint the magnetic pull. These are 65 lb pull magnets that we use for our paper patterns. By a stroke of luck (blind squirrel finds acorn) we noticed in scuffing the inside of the roof that the magnet location readily appeared, for a more accurate locating method.

Video:


https://www.youtube.com/watch?v=Ubq89aPMJjY




.

Re: Finding lows for metal bumping
MPandC #1261096 Sun Apr 01 2018 03:02 AM
Joined: Mar 2010
Posts: 9,520
5
Master Gabster
You gotta love accidental genius.

Re: Finding lows for metal bumping
MPandC #1261098 Sun Apr 01 2018 03:18 AM
Joined: May 2015
Posts: 3,409
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Robert strikes again. thumbs_up
My shop is so full of metal dust, that's gotta work for me.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Finding lows for metal bumping
MPandC #1261120 Sun Apr 01 2018 01:37 PM
Joined: Dec 2011
Posts: 445
Shop Shark
Brilliant!

Thanks, Robert.

-Jim


1957 Chevrolet 3100 Stepside
235, 3-speed w/OD
In the Stovebolt Gallery [stovebolt.com]
Re: Finding lows for metal bumping
MPandC #1261205 Mon Apr 02 2018 01:53 AM
Joined: Jul 2011
Posts: 705
M
MPandC Offline OP
Shop Shark
Had a couple questions on what the heck I'm showing in the video.. Haha... so let's clarify..


We were blocking out the primer on the roof and came across a few low spots. These were low enough to be seen in the paint if left alone, and yet mixing and sanding any filler "repair" would have taken longer than some simple bumping of the low area.


Since I don't have a Bullseye Pick, we thought to use some gentle hammering with a crowned body hammer beneath into a small shot bag on the top (outside) of the roof. We have some 65 lb pull rare earth magnets that we typically use for our paper patterns, and this showed to have enough strength to pull through the roof skin. So we placed the magnet in the center of the low area, and in order to locate on the underside, would skim across the roof from beneath with the hammer face to see where the pull was strongest. The location was then marked underneath with a sharpie, magnet removed and replaced with the shot bag, and the area was tapped into the shot bag until blocking showed the area where it should be.


On one of these "marking with a sharpie" efforts, there was a slight bit of dust on the bottom side of the roof, so I gave it a wipe with my hand to displace the dust and instantly saw the outer circle of the magnet. This was much more accurate than using the magnetic pull test, so we changed to this, and the metal bumping effort worked well. We surmise that this "dust" that clings to the magnetic field is likely sanding residue from the primer, or sanding residue from dressing welds inside the car, or both. In any case, it worked well to help transpose the low spot locations to the bottom side for more accurate hammering.

Re: Finding lows for metal bumping
MPandC #1261209 Mon Apr 02 2018 02:12 AM
Joined: Feb 2010
Posts: 335
G
Shop Shark
Pretty cool what one can learn by accident. I’m going to se if I can reproduce the action on my panel truck. I’m working the bag of walnuts out that the previous owner put in the roof. Thanks for sharing Robert




These old bolts are in my blood. Hard thing is focusing on just one.

1937 Chevy 1/2 ton panel
1953 GMC 2 ton. future car hauler


Moderated by  HandyAndy, klhansen 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4