Re: IH obsolete parts availability

Posted by Wardner on September 12, 2006 at 09:39:43 from (4.154.247.46):

In Reply to: Re: IH obsolete parts availability posted by JohnG(TX) on September 12, 2006 at 08:35:49:

I have made four patterns from scratch on other non-IH projects. Two of them required cores, core boxes, and core print provisions. This gearbox is fairly simple and I think my home-made patterns would not be rejected by a foundry. It is helpful when someone such as myself has an original part to look at. When the parting lines are evident, it is easy to see how to proceed.

I had never thought of doing my own casting. But it is true the primitive industrial and artistic societies have been doing it for years. Seeing as this would be a limited run and that I have no other stuff I need cast, I would either have to make multiple identical patterns and cores or pour the castings in many different "heats". A foundry can more easily cast my part as they pour other jobs. The labor cost and return on invested capital is insignificant for them but huge for me.

At this point, I can see an initial run of 10 gearboxes. I am sure I could sell those. It would be nice if I could eventually make several hundred but who knows. I have no idea what the market is like. Costs will be high and probably restrict sales.

I see the castings and related machine work as being one of the easiest aspects of this job. The gears will be a problem for me. The idler gear is 39 teeth and I can't find one. 40 teeth is standard and I don't know anything about pitch diameters, pressure angles, modulesses, requirements for grinding or unground, heat treating, etc. It is over my head and I will need help. The first step is to remove my gearbox and show it to professionals. Thank goodness it only weighs about 10 lbs.

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