Does this 915 dogring have the backcut?

[stownsen914]

It's been known for a while that the R&S dog rings make in the last years didn't have the correct angled backcut on the dog teeth. I have a dog ring that is of unknown age, so I want to make sure it has the backcut before using it. I think it does. What say y'all?

Thanks ...

[rgofast]

Ask Roger Brown at CMS

[Jonny042]

At a glance, it looks like it does, but if you throw a synchro ring on it, it will be immediately apparent. This one does have it:

[proporsche]

isn`t the top picture 2nd gear and the next pic with the synchro 1st gear??
Ivan

[Jonny042]

Originally Posted by proporsche

isn`t the top picture 2nd gear and the next pic with the synchro 1st gear??
Ivan

Yes, but they use the same synchros, and the friction surface of the synchro bears upon the back-cut.

I think?

[proporsche]

nope ...the 1st gear has a special synchro ring with the groove in it..look 2nd does not

Ivan
1st

2nd

[Jonny042]

Originally Posted by proporsche

nope ...the 1st gear has a special synchro ring with the groove in it..look 2nd does not

Ivan
1st

2nd

LOL. Ok, you got me, but the back - cut is the same, right? I was just trying to answer the OP's question by showing him a synchro, and how it rests in the dog teeth.

[Trackrash]

And you can check the spec like this.

[Jonny042]

Here's a pic of 2nd, for reference.

[Peter Zimmermann]

Jonny 042: GREAT pictures!

[kevingross]

I wouldn't measure the installed dimension until fully assembled, in particular with the snap ring in place. Also I measure at 90 and 270, if you consider the gap in the ring to be 0.