I was wondering if there is a way to mount a cim or hex shaft onto a 775 pro directly so that I do not to use pinion press gears. I have looked at the CIM-ile from WCP, but it is too big.
You can use a VersaPlanetary gearbox with no inner gear stages to get any output you want.
You can press a reamed hex shaft onto the 775 Pro shaft. Then u can just use the hex shaft.
This is the only route I can think of that doesn’t involve pressing pinions on that runs things at full speed. There’s also the AndyMark DeCIMate, which ships with the pinion gear pre-installed, but you may not want a 3.75:1 gear reduction in there. (Or maybe you do. In that case, snag that and you’ve basically got a CIM mounting package.)
Or, if the actual issue is “I don’t want to press on pinions” and you can work with 12T 32DP gears, AndyMark offers a RedLine motor (functionally equivalent to the 775pro) with that pinion already installed.
Knowing the use case and why pressing pinions is to be avoided will help steer us so we can steer you! 
(Full disclosure, I worked for AndyMark from 2016 to 2017.)
Even if you don’t use a VersaPlanetary, the clamping interface of a VersaPlanetary is rather simple and a similar concept could be applied with a number of custom parts. However, the effort and maintenance with getting a good clamping fit may end up being more substantial than using a press fit.
How about just putting the ½” hex shaft universal adapter into the VP input coupler
I am not looking to avoid pressing a gear, but just need to make a longer shaft on the 775 pro in a small space. So would taking a hex shaft, drilling a hole in it and pressing it onto the 775 pro work?
I would worry about shaft whip. If the extension isn’t made pretty darn concentric/perfect/balanced and a 775 running at 19K could be a problem if the extension isn’t supported at the end. Depending on how long and heavy the extension is, it could be pretty violent when it decides to start “whipping”. Here’s an exaggerated example.
:eek: :eek:
[adds video to shop safety playlist]
Pretty serious problem with that E-Stop. Try to hit it and the whole arm just swings away; “You ain’t stoppin me today!”