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Forum: Buck Building 06-12-2018, 06:43 AM
Replies: 12
Views: 1,281
Posted By mark g
I've used gorilla glue which is expanding...

I've used gorilla glue which is expanding polyurethane. I cut grooves in the foam for the glue to flow through as it expands. Adding some moisture to the joint helps encourage the expansion and...
Forum: Basic questions and answers 03-28-2018, 07:29 AM
Replies: 7
Views: 887
Posted By mark g
Hi Steve, I've made smaller versions of...

Hi Steve,

I've made smaller versions of these shapes by starting with a cone made to the average shape of the trumpet, then "raising" the cone into the trumpet shape with stakes and hammers...
Forum: Automotive Projects 12-16-2017, 10:24 PM
Replies: 10
Views: 1,424
Posted By mark g
Hi Kevin, It looks like that may be a...

Hi Kevin,

It looks like that may be a grooved flat lock seam, aka pipe lock seam. I think the Pittsburg lock Kerry mentioned is the other common ductwork lock but is usually used at a corner...
Forum: Miscellanous products related to metalshaping 06-24-2017, 09:25 PM
Replies: 22
Views: 4,890
Posted By mark g
I have two arbor presses that I acquired for...

I have two arbor presses that I acquired for exactly this kind of work. One is a large 12ton Greenerd No. 5 with a 13" throat, and the other is a 5 ton Weaver "Motor Service Press" that has a nice...
Forum: Basic questions and answers 09-29-2016, 03:25 PM
Replies: 54
Views: 14,798
Posted By mark g
Hi Martin, Sorry for not being clearer. ...

Hi Martin,

Sorry for not being clearer.

I'm just suggesting to start with an oversized piece of metal, so that the metal has more resistance to being pulled into the die. The metal will tend...
Forum: Basic questions and answers 09-29-2016, 08:22 AM
Replies: 54
Views: 14,798
Posted By mark g
Starting with an oversized blank will add radial...

Starting with an oversized blank will add radial resistance to the punching force, and will tend to draw the wrinkles radially from the center more.

It will then also require more force.
Forum: Basic questions and answers 06-11-2016, 08:40 PM
Replies: 5
Views: 1,981
Posted By mark g
I'll elaborate on the layout part. Draw your...

I'll elaborate on the layout part.

Draw your conic cylinder from the side view.

Extent your side slanted lines upward until the meet.

From that point back to the base (in the side view)...
Forum: Basic questions and answers 06-11-2016, 08:10 PM
Replies: 5
Views: 1,981
Posted By mark g
The subject of conical layouts has been covered a...

The subject of conical layouts has been covered a few times here previously. You can do a search. I use a method similar to this one:

http://allmetalshaping.com/showpost.php?p=34276&postcount=2...
Forum: General Discussion 05-10-2016, 08:21 PM
Replies: 12
Views: 2,638
Posted By mark g
This is a way I used to scale up models using a...

This is a way I used to scale up models using a drill press.

It involves suspending the model over a piece of plywood (flat, smooth) with a grid (graph paper) glued or stapled to it. The model is...
Forum: MetalShapers Hall of Fame 05-02-2016, 07:20 PM
Replies: 10
Views: 13,601
Posted By mark g
Thank you everyone, for the kind remarks. There...

Thank you everyone, for the kind remarks. There is such distinguished group of craftspeople participating on this forum as to make this a particular honor. Thank you!:):):)
Forum: Basic questions and answers 02-08-2016, 07:11 PM
Replies: 9
Views: 2,051
Posted By mark g
Some processes can cause shrinking and stretching...

Some processes can cause shrinking and stretching at the same time which to varying degrees, cancels out the change in thickness. Shrinking parallel to an edge and stretching perpendicular to the...
Forum: Introductions 05-23-2015, 07:16 PM
Replies: 4
Views: 1,098
Posted By mark g
Thank you Justin. There was a bit of both...

Thank you Justin.

There was a bit of both taxidermist and sheet metal fabricator in my past and one day they got mixed up together.:)
Forum: Basic questions and answers 05-14-2015, 08:11 PM
Replies: 9
Views: 3,538
Posted By mark g
I remember having to make a part like this once...

I remember having to make a part like this once on a press brake. We would make a temporary bend (maybe 30 degrees or less) in the middle of the 1-1/4" section to allow the other bends to be made,...
Forum: Introductions 05-05-2015, 10:07 PM
Replies: 4
Views: 1,098
Posted By mark g
Hi Justin, Welcome to the site! I'm in...

Hi Justin,

Welcome to the site! I'm in Walpole, NH. I make sculptures, mostly .

-Mark
Forum: Basic questions and answers 05-01-2015, 08:21 PM
Replies: 14
Views: 8,929
Posted By mark g
That's one to remember. Thanks.

That's one to remember. Thanks.
Forum: Introductions 04-23-2015, 06:16 AM
Replies: 2
Views: 651
Posted By mark g
Hi Cory, Welcome to the group. I...

Hi Cory,

Welcome to the group.

I envy your inheritance of books and tools from your Grandfather. I was a duct maker myself for a while and began collecting what I could find of books and...
Forum: Introductions 04-17-2015, 06:46 PM
Replies: 3
Views: 923
Posted By mark g
Hi Jonathan, Welcome! I recognize your work...

Hi Jonathan,

Welcome! I recognize your work from images I've seen of it in my area, (Walpole NH).

Mark
Forum: Basic questions and answers 04-14-2015, 10:35 PM
Replies: 14
Views: 8,929
Posted By mark g
Hi Kent, I didn't quite get your meaning on...

Hi Kent,

I didn't quite get your meaning on this statement. Do you mean that you tape the faces as a reminder to clean or is the taping the cleaning?

Mark
Forum: Automotive Projects 04-13-2015, 02:31 AM
Replies: 6
Views: 3,273
Posted By mark g
Here is a method to pattern transitions. You...

Here is a method to pattern transitions. You could use it to make a pattern or check the one Solidworks is giving you.

http://www.allmetalshaping.com/showpost.php?p=46392&postcount=6
Forum: Basic questions and answers 04-12-2015, 08:14 PM
Replies: 14
Views: 8,929
Posted By mark g
I knew of a person who sailed an aluminum yacht....

I knew of a person who sailed an aluminum yacht. Before he would let anyone aboard, they had to empty their pockets of any coins. The fear was that if the copper in the coins ended up in the water in...
Forum: Basic questions and answers 04-11-2015, 07:29 AM
Replies: 14
Views: 8,929
Posted By mark g
cross contamination of metals

Relative the discussion of cross contamination of steel and aluminum when tools are not dedicated to each material-

For the guys observing this practice, do you also have sets of tools for every...
Forum: Shop Safety 02-04-2015, 07:46 PM
Replies: 82
Views: 37,333
Posted By mark g
I've found that when I have to work in...

I've found that when I have to work in uncomfortably cold temperatures, wearing a dust has a positive impact on how cold I feel. It seems to capture the heat in my breath on the exhale and pre-warm...
Forum: General Discussion 01-10-2015, 06:14 AM
Replies: 6
Views: 2,508
Posted By mark g
Cass has a bit in his book about using a small...

Cass has a bit in his book about using a small hammer for working metal without a back up dolly. There is something to getting the metal to move before it has time to react to the blow and all the...
Forum: Basic questions and answers 01-08-2015, 09:34 AM
Replies: 13
Views: 4,418
Posted By mark g
Are you thinking to stretch the metal beyond the...

Are you thinking to stretch the metal beyond the original tub using the roller and weight, or to just pop the existing cone inside out (invert it).

The tub is a stable shape. I think it would...
Forum: Welding Sheet Metal 01-02-2015, 08:32 PM
Replies: 2
Views: 1,873
Posted By mark g
I don't know about the foam brushes, but my...

I don't know about the foam brushes, but my cheesy solution for this was to pull the bristles out of a steel handled acid brush and push them into a short length of rubber or plastic hose/ tubing...
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