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Mine are Straight cut, never seen helical full roller.

They were in development though i think, was it Minispares?

I saw pics of one used set about a year ago but none in real. Will dig out the pics later

Rusty old S wrote: ↑Mon May 22, 2023 4:17 pm Mine are Straight cut, never seen helical full roller.

Here

Exactly. Spider do you have source where to get them?

phil82 wrote: ↑Mon May 22, 2023 9:19 pm Exactly. Spider do you have source where to get them?

This one is an A+ type, the conversion is my own brew. I've done a few of these and so far, seem to be working well.

Years back, Jack Knight offered them for A types.

Please excuse me if I am stating the obvious. But doesn't it make more sense having a roller bearing helical idler gear than a straight cut one. Surely it is the side loading on these gears that is always the most important thing influencing their performance.

IIRC it was also someone on Turbominis who did that.........

mk1 wrote: ↑Tue May 23, 2023 1:32 pm Please excuse me if I am stating the obvious. But doesn't it make more sense having a roller bearing helical idler gear than a straight cut one. Surely it is the side loading on these gears that is always the most important thing influencing their performance.

Yes, the side thrust is the bigger issues I've found with helical idlers. That is a pair of Tapered Rollers with a spacer between them in those that I've done. There is though a type of Cylindrical Roller, similar to those used in the Straight Cut gears, that can take side thrust, but those I looked it were marginal for thrust loading in this application.