recessed ares for cross bolt washers

[dozz302]

Hello, what tool is used to make the recessed indentations for the cross bolt washers in the block?

[pbf777]

      As originally machined by Ford Motor Co. I don't know; but in cross-bolt cap conversions I've just utilized an appropriate (tailored) end-mill on the Bridgeport.   

      Scott.

[dozz302]

Thanks, what do you mean by "tailored".

[galaxiex]

It's a counter bore or spot facing tool.

You can buy them on McMaster.
Amazon even has them.

McMaster link... >>> https://www.mcmaster.com/products/spot-facers/counterbores-3~/

[427Fastback]

Agreed...spot facing.

[fekbmax]

I use a spot facing bit.

[pbf777]

Thanks, what do you mean by "tailored".

     In order to replicate (if that's important) the machined relief as executed by Ford Motor Co. one will probably need to "tailor" an acquired cutting tool for the proper diameter and radius. The reshaping of an end mills' (or any other tooling) cutting edge in order to achieve the the desired results is practiced by most any machine shop; this rather than having to order new tooling for every odd instance, that unless specially specified (custom) most often won't be correct anyway, and is one of the reasons we have hundreds of end mills in the tooling cabinet and is why I pick them up when cheaply had at swap meets, auctions, etc.   

     Yes, technically one might chose to define this task as a "spot-facing" operation, but that doesn't mean you "have to have", or that it can 'only' be executed with a dedicated, labeled as, "spot-facing" tool (that you would probably also have to "tailor" anyway).  It's simply the process of removing metal and creating a desired result, nobody cares what cutting tool was utilized as long as a 'proper' and 'timely' result is had; and often an "end-mill" will perform this task just fine.   

     But yes, dedicated "spot facing" tooling is available, and the "piloted" type can speed-up the process of alignment (with the hole  ) and are particularly handy for not so well supported and rigid efforts; but your also going to need some sort of "mill" in order to accomplish this as it's a bit beyond the capability of a hand-held drill.   

     Scott.

[frnkeore]

I'm a aerospace machinist, of over 50 yrs experience. You can't use a end mill to spot face or counter bore a area, unless you can interpolate that area, with a smaller end mill.

End mills have a end cutting relief of 3 to as much as 7°. Meaning that the center of the cut, will be higher than the outside edge.

A c'bore or spot facing cutter could be used, by hand, IF the pilot is is very close fitting, say .002, and fairly light pressure used, so that you don't push it off to the side, while applying pressure.

All the above, is based on the hole, for the cross bolts has been done accurately in a milling machine.

[pbf777]

You can't use a end mill to spot face or counter bore a area, unless you can interpolate that area, with a smaller end mill.

     Yep, and why I said:  "..............dedicated "spot facing" tooling is available, and the "piloted" type can speed-up the process of alignment (with the hole  )"

End mills have a end cutting relief of 3 to as much as 7°. Meaning that the center of the cut, will be higher than the outside edge.

     Yep, and why I said:  ".............."reshaping of an end mills' (or any other tooling) cutting edge in order to achieve the the desired results ............"

A c'bore or spot facing cutter could be used, by hand, ......................

   

    No argument, in that such "could" be done by hand (after all the Egyptians did manage to build the pyramids by hand! ) but I think the something around 1-5/16" diameter relief into cast iron is going to be a tad laborious, particularly if it's to come out right.   

    The O.P. was inquiring on "what tool is used", and my response was that I didn't know "what was used", this originally by F.M.C. (wasn't there! ), but that I have successfully replicated such utilizing a "tailored for the job end mill" and the fact of the matter 'is' that it can, has and does work just fine, if the operator in the execution knows what they're doing!   

    Scott.