What Material to Use to Build Up Aluminum Part

[skeeljc]

Looking for suggestions on a material to use to build up the inside diameter of an aluminum part. The part ID is 3" and the length of build up needed is 0.60". The surface to be built up is bright dip anodized. I need something I can apply that will harden quickly. The build up will be machined to dimension with a boring bar in the lathe.

 

[762plinker]

what is the end use ?? application

 

[gunsandgunsmithing]

Yes, more info would help but you might make a sleeve and use 609 loctite sleeve retaining compound. Good stuff for that kind of thing.

 

[Sniperhandle]

You can tig weld it with alum rod, 4043 is easier to weld with and looks nicer, 5356 is a little harder to use but is a lot stronger, The part should be pre-heated if using 5356 and must be very clean.

 

[skeeljc]

Application is proprietary. Cannot weld because I need to maintain present finish appearance.

My first thought is JB Weld. Looking for other similar, easily applied materials.

 

[Walt Krafft]

How thick of a buildup?

 

[skeeljc]

.020" max thickness of build up. The build up is on an existing fine pitch thread. I need to cover the thread and then bore the build up to size. The mating 100mm diameter part will be attached with a thin coat of epoxy. The mating part is a glass tube. This will be repeated on a production basis.

 

[skeeljc]

I have considered machining the ID thread away and then building up the freshly machined surface.

 

[Rockchuck]

I would machine surface then make a sleeve fairly thick. Install with retaining compound then machine to my desired size. Just what mike said to do.

 

[skeeljc]

I would machine surface then make a sleeve fairly thick. Install with retaining compound then machine to my desired size. Just what mike said to do.

Looking for an easier solution that machining a 2.80" hole in a 3.00" diameter part.

 

[Tucker65]

A sleeve pressed in or held in with loctite would be the way up go. If you have quite a few of them to do the sleeves could all be made ahead of time once you figure out the sizes.

 

[muleystalker]

How about DEVCON Aluminum 10710 ?

 

[Sniperhandle]

Looking for an easier solution that machining a 2.80" hole in a 3.00" diameter part.

Check McMaster Carr or Boston gear they may have what you are looking for without all of the headache.

 

[Bob3700]

If u want an easier route for the sleeve, look into some tubing. No need to use solid round stock.
Devcon aluminum putty, although .020 is pretty thin to try to machine threads into.

 

[gunsandgunsmithing]

Too many unknowns for a good answer. I understand it's proprietary but it's tough to answer without something more to work with. Anodizing is typically done after machining. Would the finish matter for a prototype? Once you have a system in place, then you could refine the process for mfg. Sounds like you're starting with a part that already has a finish that is challenging for adhesives etc, too, but I have no idea of the strength required.

 

[WSnyder]

So you need a sleeve 3" OD, 2.960" ID, W .060"???

McMaster 3" OD tube, .049" wall (.049" is the cheapest). Cut a .100' or so length, put it in with retaining compound, face off and machine ID to dimension. Any of the Loctite bearing retaining compounds will stick to anodize when used with the primer. BTDT

 

[skeeljc]

JB Weld I do like the tubing idea.

Here is how it looks cleanded up

 

[skeeljc]

This is a larger 4" diameter part with 100mm glass tube held in with clear epoxy. I would like to have a better method of fitting the part to the glass tube. The glass tubes are not round and not all the same diameter.

 

[gunsandgunsmithing]

This is a larger 4" diameter part with 100mm glass tube held in with clear epoxy. I would like to have a better method of fitting the part to the glass tube. The glass tubes are not round and not all the same diameter.
View attachment 1434032

Glass can be a real challenge for adhesives but I'm guessing this is essentially the same as rear view mirror adhesive. It might be the ticket but you still might need to do some minor machining to get everything the same size or at least to where they will fit one another.

Amazon.com

 

[gunsandgunsmithing]

JB Weld I do like the tubing idea.
View attachment 1434030

Tubing is more expensive, generally, but sounds like it might be the ticket in your case.