
drooling idiot wrote:I suggest as an alternative to tacking it together and THEN filling the large gaps , try building up the individual sections while they are apart .
This method ...
1) gives you the ability to manipulate the torch into positions that are very awkward or impossible when its together.
2) lets you use a thicker backer bar early in the process so you can use a little more heat where the old meets new for good fusion.
3) makes it easier to grind and clean the prep welds , especially inside.
4) makes filling the small gaps still left almost fun .
After the large gaps have been filled then line the parts up and tack into one piece.
I've had good luck lining the pieces up with just a stupid string line and some patience.
drooling idiot wrote:I suggest as an alternative to tacking it together and THEN filling the large gaps , try building up the individual sections while they are apart .
This method ...
1) gives you the ability to manipulate the torch into positions that are very awkward or impossible when its together.
2) lets you use a thicker backer bar early in the process so you can use a little more heat where the old meets new for good fusion.
3) makes it easier to grind and clean the prep welds , especially inside.
4) makes filling the small gaps still left almost fun .
After the large gaps have been filled then line the parts up and tack into one piece.
I've had good luck lining the pieces up with just a stupid string line and some patience.
Karbinator wrote:drooling idiot wrote:I suggest as an alternative to tacking it together and THEN filling the large gaps , try building up the individual sections while they are apart .
This method ...
1) gives you the ability to manipulate the torch into positions that are very awkward or impossible when its together.
2) lets you use a thicker backer bar early in the process so you can use a little more heat where the old meets new for good fusion.
3) makes it easier to grind and clean the prep welds , especially inside.
4) makes filling the small gaps still left almost fun .
After the large gaps have been filled then line the parts up and tack into one piece.
I've had good luck lining the pieces up with just a stupid string line and some patience.
I see what you're getting at Drool--Preliminary fill could help on spots that were severely torched out (being able to stick fingers through). Perhaps set up the reciever first...scribe original positions...undo and fill...return to scribed lines. This way, one would not loose the length setting if they built up so much the parts were pushing away. Lines for position.
Pirates brace bars not only line pieces up, but do alot of position holding when the connection welds are being made. Strings are good for checking... you can even lay a straight edge ontop the ratchet plate for the front and back alignment, but you really have to have that sucker Stable for the potential heat twisting that's about to occur.
MauserMatt wrote:Man, this looks like quite a process..........
I hope I can do it.. Though I'm not sure about the welding part, I think I can.. I only have (very little) experience with cheap arc welders. Gonna need to find someone to do the welding I guess.
Looking good Pirate!! Can't wait to see pics of her all finished up along with a range report!!! Wish I had my kit to look over while you're doing this too.. Do you have a model/part number for that TIG welder you got from Harbor Freight? I wonder if I could have it welded into a 100% receiver cheaper than spending the $400 you did on your welder..... I guess I'm just thinking out loud...
Return to “MG42 Build It Yourself”
Users browsing this forum: No registered users and 2 guests