So what is this and how do I use it?

[Bill C.]

Well aside from size they all look a lot like like the ones in Shawn's pic.
That said, here are some pictures of my own: View attachment 50730View attachment 50731View attachment 50732View attachment 50733

The 3 shown are:UDT (HS-12) 6 x 1; Gooddard 6 x 1/2; Unknown manufacturer 2 1/2 x 3/16.

Oh, and I did a better count, it is more like there are 4 dozen+ of these heavy little f-ing things!

Karl

Karl,
You use those cutters on a horizontal milling machine. You need a arbor to mount them on.

 

[stupoty]

This guys videos on youtube are pritty good for giving an overview of machining stuff.

hears one on dividing heads to watch whilst having a cup of tea.

http://m.youtube.com/#/watch?v=pIg8InzUu3U&desktop_uri=/watch?v=pIg8InzUu3U

Stuart

 

[Rtonder]

Below is my Frankenstein version made from a combination of Ebay items. As explained very well by others, by turning the crank an amount controlled by the many small holes in the index plate, you can rotate the work fraction of a degree very precisely. Although I don't do a lot of index work, I find it works great for "turning" grooves in round stock that must be a precise width and depth, as for an O ring or snap ring. Rotating the mill head gives additional possibilities on the shape of the groove. If you're using a vertical mill, you can mount your circular cutters in a R8 adapter for that purpose, and "turn" shallow, concave grooves having the same radius as the cutter by approaching the work from the side. The device has seemingly endless possibilities.

View attachment 50806View attachment 50806

 

[Truebane]

Karl,
You use those cutters on a horizontal milling machine. You need a arbor to mount them on.

Got that! I have a "Rockford Miller Model No. 1 1/2A" Horizontal Mill with the overhead arbour holder thingy. Built around 1910-20 I think. It is run off of a 3/4 (or 1?) HP motor and uses 2" leather belts. It is very cool.

Karl.