[gpw123]

Well I just finished my retrofit of a Shizuoka AN- S mill and after a few hours of fun it shed a few teeth on the nylon gear
in the head . I rebuilt the upper part of the head but thought the gears looked OK.
I would like to get this fixed if possible as I put a lot of effort into this thing.
I am hoping someone else may know where to get one or has a print or CAD drawing of the gear.
I have a parts manual with a part number if it helps.

Any info may help . My boat isn't big enough to use it as an anchor.

Thanks,
Tim

[gpw123]

So I looked in my photocopied manual for the Shizuoka and noticed in the notes section of the part number for the nylon gear (99) 05110380 there is a number that is unreadable on my copy.
It starts out 2m6? and the rest is illegible . I am hoping it is the gear specs. -dia., # of teeth etc. If anyone has a better copy or original and can share that number it would be
very much appreciated. I'd like to avoid disassembling the head until I know I have all the parts in hand if possible.

Thank You,
Tim

[sparks-n-chips]

Hi Tim,
I also have a Shizuoka AN-S with a trashed back gear. Your question was years ago, but if you are anything like me, you might still be working around it. I am in the process of reverse engineering a new backgear for it. In the book it says "Nylon Gear" so I guess that is what I'll go with. I have taken caliper measurements and hi-res photos of the castings to get the hole-to-hole center distances and measured the original metal gear. If I setup to make one I can probably churn out some more easily enough. If I order them I expect gears 2..N are a lot cheaper than number 1. I'll publish what I learn here or a link to my site with the write-up.

Sparks-n-chips

[machinehop5]

...use Delrin. its stronger and machines nice.
https://www.dupont.com/brands/delrin.html

[sparks-n-chips]

...use Delrin. its stronger and machines nice.
https://www.dupont.com/brands/delrin.html

machinehop5, thank you for the idea. I have considered Delrin; however my recollection is that Machinery's handbook showed it had roughly the same hardness and strength as nylon, but not as good impact resistance (nylon was better). I can imagine the impact resistance could be important when I think about it being low gear and that it will be used for fly cutting and similar operations. I was also thinking it lasted for about 30 years before it broke the first time, so maybe Nylon was good enough. I can be talked out of this choice. The lubricity of Delrin is great, too -- but I think it was age that killed the gear and not wear. How would you think about impact resistance in this choice?

[sparks-n-chips]

My book shows in the notes section the gear is an 2M64. That translates to Module 2 (medtric) 64 tooth. I have made a drawing of mine and I'm either going to machine one myself or see where I can order it. I'll post a drawing here. Ping me if I forget!