# Re: No.104 Straight bevel generator - cutter designation letter

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Posted by Dimebag on December 27, 2016 at 19:24:04:

In Reply to: Re: No.104 Straight bevel generator - cutter designation letter posted by BillS on December 19, 2016 at 12:09:48:

Hi Bill
Sorry for the late reply, I was out of the office. Thank you for your efforts to help.
I will try to explain better. What I need is the angle between the two cutter spindles on the 104 machine. As you put a protractor on the both face surfaces of the cutter spindles and measured the angle. It should be a more than 2x20=40 degrees, maybe around 50 degrees?

If you are interested - I need this angle to calculate the amount of crowning for a job. Having the gear data and some information about the setup of the machine I have been able to calculate the resulting blade pressure angle of the generating rack as 22d35min. The blades have a small negative angle, that adds up with the cutter spindle angle. It allows to control the crowning of the teeth. If the gear specs call for a different PA as the resulting one, the roll ratio is modified accordingly to compensate for that. PA is really a generation rack's profile angle, but most people refer to it simply as PA.

I also find a parameter called "Pattern length factor" equal 2.234, but I don't know what it means.

If I downloaded the CPC-BV4 software I would probably find the blade pressure angles for each cutter designation letter, but still would be unsure if the A cutter has 0 crowning angle. However, if you'd confirm, that a A cutter produces 0 crowning, then its blade pressure angle would be the same as the cutter spindle angle, which I'm looking for.

Your feedback will be much appreciated.
Thanks,
Dimebag

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