internal O-ring grooves?
 

I am in the process of building the turning cylinders for my adt project and am having trouble figuring out how to cut the internal o ring grooves for the piston rod seals. bore is 0.190 so there is not much room to get a tool in. I tried grinding a tool bit to get inside the hole to cut the grooves but it broke. Any help would be appreciated.

Re: internal O-ring grooves?
 

This is what i got......close you'll might be able to use this.http://www.penntoolco.com/30-464-2/?...CABEgKVh_D_BwE

Re: internal O-ring grooves?
 

And this one might work depending on depth.http://internaltool.com/products/lat...etail-groovers

Re: internal O-ring grooves?
 

and this one is great suplier too.https://www.carbideanddiamondtooling...ies-24-ID-2831

Re: internal O-ring grooves?
 

Thanks Bo! Looks like I’m going to have to spend some $$ to get one of these cutters.

Re: internal O-ring grooves?
 

Tools aren't cheap if you wanna have a good seal.....i assume it's for hydraulics funktion. Otherwise you could Mc Iver a tool bit with some grinding.
I've saw some for $40 to make one grove it's expensive yes.

Re: internal O-ring grooves?
 

I use a Iscar Picco tool for internal grooves, paid something like 30 USD. There are many sizes. It has straight corners, function just fine. For a holder I drilled a hole in a square bar, put a couple of set screw.

An example,
https://www.jurassictools.com/store/...ooving-bar-new

Re: internal O-ring grooves?
 

http://i1357.photobucket.com/albums/...ps9hnxxmbu.jpg

I had been using tools that I ground myself for a while. Would never get consistency and forget about taking a couple more thousands off after original cut. Finally purchased these and still look new. First time I used the purchased ones I thought they came loose because I couldn’t feel anything. But it was cutting like butter. (In brass). Used them on stainless and on low carbon steels. Still like new. Unless you have a good understanding of cutting geometry and a pretty precise grinding wheel I (knowing what I know now) would spend the $20-40 on it. But on the flip side forming your own tools is rewarding once you get it correct. Me personally, not that I don’t want to learn and understand cutting geometries, I would rather learn how to make the parts :). And if you are making grooves for the cylinders try to get the shortest shank tool. More rigid=better cuts. With these ones above I can secure them in quick change tool holders. A dedicated holder would be nice but these have flats ground into them so as long as they are on centerline and parallel I’m good to go. Hope this helps :).