Rich -
Generally I am supportive of this, but the costs involved are pretty steep
for me, as the cost of used boxes aren't all that far off. I know, I have 5
good spare boxes as back ups for my BN1 and A90!
If it could be done at that price for a complete matched set of gears
(remember, early boxes can't take a partial swap), that might work better.
Alan
'52 A90
'53 BN1
'64 BJ8
On Sun, Jul 5, 2009 at 12:06 PM, Rich C <richchrysler@quickclic.net> wrote:
> Hello all,
>
> I have been working with a brilliant machinist who is into CNC machining,
> CAD
> programming, and specializes in gear cutting.
> He's looking for challenges in his business and asked me what's needed. I
> handed him a later BN1 laygear with a shattered 2nd gear (3rd gear
> internally), explaining that this seems to be their weakness and if I had
> good
> laygears and 2nd gears, I could reassemble a number of BN1 gearboxes and
> put
> them back into service.
> He happily took this as a personal challenge and has come back to me 4
> weeks
> later with quotes and a metallurgy report on the original.
> It seems that the original is very hard, too hard in his opinion, with a
> Rockwell reading of 64 to 66 which is likely why when they let go, they
> simply
> shatter like glass, taking the other gear with it.
> Anyway, making the complete laygear new is no problem. Machining and
> installing the bronze inserts in each end would be included as part of the
> process.
> Of course as with anything, the more pieces made, the cheaper it will be.
> I am no machinist, but I'll quote what he has said. He gave me 3 prices for
> different hardness qualities.
>
> All case hardening to be approx. .020" deep as per original.
>
> He recommends 9310 case hardened where:
> - 5 pieces @ $1576
> - 20 pieces @ $1335
> - 50 pieces @ $1120
>
> Next he quoted 8620 case hardened where:
> - 5 pieces @ $1420
> - 20 pieces @ $1183
> - 50 pieces @ $1034
>
> Last, he quoted 4140 Nitride where:
> 5 pieces @1490
> 20 pieces @1254
> 50 pieces @1105
>
> These can be done as soon as there is an order placed of at least 5 pieces
> minimum. We would ask for 50% up front.
>
> I stated that I would need to run a prototype in a gearbox on the road to
> prove out the product before accepting orders.
> Please note that this would be a duplicate of the later laygear, as applied
> from gearbox 5146, being part number 1B 3693, laygear c/w bushes.
>
> He's now looking into doing the corresponding 2nd gear assembly (3rd gear
> internally)
>
> Interested? Discussion please.
>
> Rich Chrysler
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