Canadian Airgun Forum
https://www.airgunforum.ca/forums/

Pot metal - how I loathe thee.
https://www.airgunforum.ca/forums/topic65415-15.html		 Page 2 of 2
Author:  rrdstarr [ Sun Dec 14, 2014 7:19 am ]
Post subject:  Re: Spare parts arrived, all is well again
EverHopeful wrote:
My replacement indexing lever arrived yesterday, so today I set to and rebuilt the 953 (for some reason non-working guns always seem to end up in pieces in my workshop - there will be another post explaining why).

Here's the broken lever, along with the new replacement and a spare of the other link in the indexing mechanism, just in case that should fail too.

Attachment:
IMG_8034.jpg


Here's a close-up of the break. There's some sort of circular do-dad in the casting which creates a weak spot.

Attachment:
IMG_8036.jpg


Sure is nice to have it back together again :)

Attachment:
IMG_8052.jpg


Happy shooting!
Jim


Jim how far away where you when you cut the cards in two? I am impressed with the accuracy you get with a cheap gun!
Author:  EverHopeful [ Sun Dec 14, 2014 8:05 am ]
Post subject:  Re: Pot metal - how I loathe thee.
Only 10m Rick, fully rested - no way I could do it offhand. Cards aren't as difficult as they seem because they are big vertically, so you're only really having to aim for windage. The problem is seeing them, which is where the high mag scope comes in handy. You can cut cards easily if you line them up in front of a bulls eye target so that you have something bigger to aim at. It's something of a cheap circus trick really. The real measure of a gun is printing consistently high scores on something like the issf rifle target.

Jim
Author:  Handyguy [ Thu Dec 18, 2014 9:20 am ]
Post subject:  Re: Pot metal - how I loathe thee.
EverHopeful wrote:
Ah, that's interesting. I couldn't work out why it was there. I guess they ejected the part before it had fully set, creating stress and fracture lines all the way through. I hope it isn't going to be a common failure, or I'll end up having to fabricate one out of something stronger.


Glue this back together, create a resin/sand, plaster/sand mould and cast a new piece from aluminum....end of grief.
Author:  EverHopeful [ Thu Dec 18, 2014 9:28 am ]
Post subject:  Re: Pot metal - how I loathe thee.
It sure would be nice to be able to cast aluminium. I find the thought a bit intimidating at the moment! I looked at some of the low melting point metals, but I couldn't find any information on the strength of the materials.

Jim
Author:  Handyguy [ Thu Dec 18, 2014 10:37 am ]
Post subject:  Re: Pot metal - how I loathe thee.
EverHopeful wrote:
It sure would be nice to be able to cast aluminium. I find the thought a bit intimidating at the moment! I looked at some of the low melting point metals, but I couldn't find any information on the strength of the materials.

Jim


Shredded pop cans. Even this would be stronger than pot metal and melts relatively easy. All you really need for small castings is; crucible, torch and sand. The final piece can be cleaned up with a dremel. Personally, I'd love to get my hands on an induction heater. Cold to molten in a few minutes.
Author:  Gippeto [ Thu Dec 18, 2014 8:26 pm ]
Post subject:  Re: Pot metal - how I loathe thee.
Make the mold as suggested...melt the pot metal part to make the new one. :idea:

ZA-12 is a commonly cast zinc alloy with good properties.

http://www.eazall.com/Gravity-Casting-Alloys

Al
Author:  rrdstarr [ Thu Dec 18, 2014 11:06 pm ]
Post subject:  Re: Pot metal - how I loathe thee.
EverHopeful wrote:
It sure would be nice to be able to cast aluminium. I find the thought a bit intimidating at the moment! I looked at some of the low melting point metals, but I couldn't find any information on the strength of the materials.

Jim



Jim? Do you have two feet of bench or counter space? A Sherline or Taig mill can be had for $1000 and you can make parts or whatever you need!
Author:  EverHopeful [ Thu Dec 18, 2014 11:15 pm ]
Post subject:  Re: Pot metal - how I loathe thee.
Oh Rick, don't mention milling machines. I've wanted a mill since roughly the day after I got the lathe :shock:

I can do small scale milling work on the lathe, so I get by. Which is a good thing as both money and space are a bit tight for a dedicated milling machine. But some of these parts would be quite fiddly to fabricate from stock, at least on a manual mill. Casting seems like a more natural approach.

Talking of milling work, I've really got to get myself a little rotary table. Trying to work around not having one can be painful!
Author:  rrdstarr [ Thu Dec 18, 2014 11:18 pm ]
Post subject:  Re: Pot metal - how I loathe thee.
I have a nice little Grizzly rotary table I got for $100. It is a 3" so pretty wee, but the right size for my small lathe/mill combo. One of the first accessories I bought!
Page 2 of 2 All times are UTC - 5 hours
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/