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#2
07-06-10, 06:08
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track
Hi guys, good subject this one, which in time is going to effect all of us one way or another! In regards to using new metal, is it not worth melting down the old track or does the process destroy the make up of the material ? As those who would be committed to buying new track ( and numbers I'm sure would help with the price ) could literally throw into the pot what buggered track they do have. Lynns right with the drilling side of it, I'm still mucking around with my drill press and jig so as to drill out flogged track ,I don't have the drill depth, the original holes are oval so those that I done have taken alot of work for not to much gain. Some of the biggest wear is to the side of the toe's of the track where it meshs with the next link. So even though I may have tightened up the track along the length a bit it is still sloppy with sideways movement.
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#3
07-06-10, 09:30
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Mould numbers
Hi Alex I dont think that there are any grinding marks on my unused track but will check it in the moring, I have quite a bit of it and will have a good look, Regards Ron
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Ron Winfer
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#4
07-06-10, 10:47
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riser, runner, feeder marks
Quote:
Appreciate you looking into that. I believe the links must have had feeder and riser and possibly runner metal protruding from them. Depending on the thickness of this attached metal from the pour, it would have been broken off or sawn off and if it was impracticle to leave it without further finishing they'd have ground the worst protrusions off the link. Also look for fairly straight thin broken off or ground sections, often along long edges where flash may have been removed where the drag and the cope (the two parts of the mold) were joined together. This is known as the parting line. Sometimes the sharp sand corners on either side of the parting line break off a bit before the drag and cope is assembled and this results in what would have been a bit of metal protruding along that seam. These parting lines may appear not all in the same plane because a mold may consist of not just 2 but 3 or more parts (not counting cores). [inserted 8/6/2010 - Another reason for Parting lines to not appear in the same plane is if the cope and drag faces are not in a flat plane - they may slope in plane too. As far as I can work out, in sand molding lateral thinking is the name of the game. The shape of the object to be cast dictates the complexity of the mold and so long as the basic rules of creating a functional, safe, mold are followed, and the simplest outcome (for economy) is chosen, then how the mold is comprised is left to the talent and skills of the foundryman. Just as important as the ramming and extraction of the pattern/pattern-pieces is the cutting of the feeder, runners and risers so that the metal flows in the desired manner and contaminants are trapped where they are of no consequence, and weight of the metal keeps the casting filled during cooling, and shrinking is controlled as much by design as possible.] Look at anything cast in metal and it usually has such marks unless it was machined and/or finished all over. Drop forged (stamped) items like spanners, etc also have evidence of flash most of the way around that is still fairly obvious.  yadaa yadaaAlex Last edited by cantankrs; 08-06-10 at 05:32.
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#5
08-06-10, 02:42
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Casting track
Hi Alex, just grabbed the first piece that I could, the pics show both ends and sides,along with the number4 on this piece and the makers name Malco,I forgot to mention that on the inside of both of the horns there is a small area that is rased with the letter A and 43,( Aust and the date I would think) these plates must have been attached to the original patterns and are approx one and a half inches long by about one quarter of an inch wide, you can even see the slotted heads of the screws used to attach them,says a lot for the quality of the workmanship in the foundry,hope the pics are of interest, I will dig out some better track if needed in a couple of days,
Regards Ron
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Ron Winfer
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#6
08-06-10, 04:40
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Carrier Track Test Instructions
The National Archives of Australia www.naa.gov.au has a large number of "Test Instructions" for carrier tracks (amongst other things).
Under "record search" on their website type in "carrier tracks". A few examples of the instruction titles that they have are; Test Instruction No 73 - Test No M144-145 - 1 set carrier tracks and sprockets from Eastern Command (partly used) Test Instruction No 273 - Test No M381 - 1 No set of new carrier tracks (same make), 1 No set of new carrier sprockets [includes one bound copy of report] Test Instruction No 218 - Test Nos M316-325 - Carrier tracks of five different makes [includes 1 bound copy of report] Test Instruction No 158 - Test No M274 - Carrier tracks ex Keach Castings Test Instruction No 2 - Test No 3 - [MG] carrier tracks ex McKay Massey Harris I would hazard a guess that the track specs would be in one of these reports somewhere. All these records are kept in Melbourne so if anyone there can spare some time to duck into the archives and trawl through what will probably be pages and pages of useless information they may eventually stumble upon the track recipe... Ian
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#7
08-06-10, 22:21
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Fantastic work Ian well done.... thanks for doing that ! i only hope in amongst that lot there is the recipe for canadian/British pattern links.
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is mos redintegro __5th Div___46th Div__ 1942 Ford Universal Carrier No.3 MkI* Lower Hull No. 10131 War Department CT54508 (SOLD) 1944 Ford Universal Carrier MkII* (under restoration). 1944 Morris C8 radio body (under restoration).
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#8
09-06-10, 05:53
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Quote:
Were you attaching some pics or have I just got my wires crossed? Regards Alex
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Hybrid Mode
