the rocker face is contacting the stone above the stones' horizontle centerline which is grinding the rocker face at an angle. I could shorten the pedestal base that the screwdriver is pointing to but am I missing something on setting this up? I will never be truing up any other rockers other than 273 rockers but is there a special sioux adapter pedestal piece for Mopar rockers? are they taller than other non mopar rockers? thank you for your time.

You can do that, but if you need the set up for something else, and it'll be too low, just put a proper thickness washer under there.

To grind it properly you will need to sweep the face of the rocker vertically against the wheel. Just touching it on there will create a rounded surface with corners prone to digging into the valve.

AMX I am wondering what I am missing as commercial shops that used this machine I'm sure ground our rockers on occaision & they would not have altered the pedestal height like I may have to do. I have tried all the configurations and the pivot assy is as low as it can go so I must be missing a sioux piece/adapter of some sort. FEETS I've seen the utube videos & my motion is correct. (sweeping it side to side against the stone as the holder pivots sideways which maintains the OE curvature) alright, unless I can get ahold of a sioux dealer which ain't likely as I understand the company has changed hands I should just go ahead & shorten the pedestal & call it good. thanks guys EDIT but I'd still like to find out what I am missing

Or use the flat face of the wheel rather than the crown.

I will see if it can be switched around to hit the wheel on the side

Why do you think they need to be trued up? How did they become un-true do you suppose?

My machine looks a little newer than yours, but that's how I do it......on the flat face of the wheel.
Mine uses that attachment on the butt grinding wheel, not the refacing wheel.

alright I will get after it & see how to arc it against the side of the wheel. EDIT the butt grinding wheel, you mean the side of the wheel like John mentioned right?

My machine has two wheels...... One for refacing the valves, one for butt grinding the tips, on opposite ends of the machine.
The rocker attachment is used on the butt grinding wheel on my machine, a Sioux 2075.

this older Sioux only has the one wheel in the pic & I'm gonna get after it again but I dont think there is anyway I can move the brackets around so it can be done on the side of the wheel & on this one you stem/chamfer the valves on the side of that same wheel, on this machine it would have to be done on the edge of the wheel in front like I saw on the utube video but there is still the height issue, so I am still missing something somewhere

Looks to me like you have to flip the rocker arm over so the pad can contact the flat of the wheel.
I don't see how you could do a proper job using the curved side of the wheel. The rocker pad needs to be flat across.

actually the 273 rocker pad (that contacts the valve) is curved. in the utube video & how I did it on an extra 273 rocker I practiced on, you sweep it across the wheel as it is pivoting in the holder which maintains that curvature but the cut it is making on the rocker pad face is tilted in the vertical plane & definitely wrong cuz the rocker is contacting the OD of the wheel above the horizontle CL of the wheel. I can shorten the fixture but unless there was a shorter Sioux adapter piece for taller? mopar rockers then I am still missing some procedure or something. it is my racing partners' machine so it might be a few days till I get over there again. any thoughts?

Post the link of the video ???

http://www.youtube.com/watch?v=K5CV3PV1Bgo it ain't a Sioux but I just noticed that they are grinding on the side of the wheel Like Kunkel mentioned earlier (not sure how I misinterpreted/got it in my head that they were grinding on the outside! but I coulda swore that in one of those other rocker arm refinishing videos that it was on the side). thanks double R for keeping me straight (as always!) . EDIT the video wont open for some reason and I did see one one of the Sioux videos that their machine does have the two wheels. looks like I need to get it to come in from the side to the wheel

Sounds like you know what you need to do.
I meant the rockers need to be flat "across". I know they have a radius on the pad.

thanks bro. Coming at it from the side is still going to be above the horizontle CL but evidently that is a non issue cuz of the flat surface. I will post further. thanks guys

Link no worky for me. So saying this without seeing the video.

Disregard for the moment how the rocker pad meets the wheel in you pics.

Appears to me the "pivot" of the fixture holding the rocker needs to be behind, squared/centered up with the pads "radius".

If you have some radius gauges you would know about where that pivot point distance would be behind the pads radius.

I'll use your pic for an rough example. Again disregard the wheel for the moment.


I know this is jumping ahead a bit but once you get the fixture swing figured out the contact point where the pad meets the "flat" side of the wheel (I would probably prefer a cup wheel but you only have the one) will not be as critical as far as being off center slightly up from the center line of the wheel/spindle.

May even want to flip the rocker over so as to swing left (into the wheel)in from the right side of the wheel with just the pad and then back out.

Can't tell for sure what all that fixture will do from a pic,...I'm more of a hands on to figure out.

Also don't take what I say to much for granted,...I haven't ground cutters for about 23 yrs

as a cup wheel was mentioned, what diameter are your wheels now ? how much extra room to you have to compensate for ? and lastly, what od is the wheel arbor ? i have several cup wheels that "may" be suitable for what you want to do, and if there is one that would work, i'll send it to ya gratis, just to see this problem worked out. how deep is the hardness on those rocker tips if you know ?

let me get over there today (if I can) or tomorrow & dig into it thoroughly & I will holler back