Don Terrill’s Speed-Talk

When I bolt the head thru the bolt holes into a threaded bar across the bottom It doesn’t flex the head strengthens it. The head would have to bend. The only flex possible is the bar ends and at 2” dia 4 inches past the head on each side. Not going to happen. However if it did flex a simple machinis...

It’s not a roll over fixture. So your assumptions are wrong. If you read it all you will see I say I can bolt plate across it and hold on the intake or exhaust sides. The bars can take a vise and or fixture for other jobs non head related. So it’s multi functional. And all the materials and such is ...

I see ! I stand corrected. Thanks for the info.

Hello all, Firstly I'm pleased all the replies and comments and hopefully more of them coming. If the idea cannot stand the criticism then it's not good enough or reasonable. Simple as that. 1. challenge is to get the guide straight up with x/y in place. - if that is not possible to learn to do in ...

There are many different shaped inserts some with a radius in the bowl ect... However using a ball to single point or penciling the shape always leaves a cusp from the step over . Maybe I’m misunderstanding the tooling you speak of

Too incompatible. If you have a good CNC, you can make as good or better seats than a single point machine can make. A single point machine is limited revolved shapes, a CNC can make any shape you want. 100% right A single point cnc seat and guide machine works in concentric circles around the datu...

Ok, that makes sense. Is that something that could be adapted to a CNC machine or is it even worth it? Too incompatible. If you have a good CNC, you can make as good or better seats than a single point machine can make. A single point machine is limited revolved shapes, a CNC can make any shape you...

It’s not necessarily a roll over fixture. The head can go on top or bottom .And it’s plenty rigid. Especially when the head bolts to it. The head strengthens it. And cutting seats and guides is not hogging.I put a vise on it and hog other jobs no problem. A lot More rigid then some of these seat mac...

[/img] Not being a expended machinest or being able to conceptualize your head fixture could you explain or show pictures Pictures of your fixture. As an example how do you stand a rotary table straight up?? I am very interested in using a vertical mill to cut Seats and install seats. Your fixture ...

ARP studs are heat treated. But not to a high standard maybe 32 Rockwell C scale . Which is plenty machinable they can’t be to hard because they have to be able to stretch. The threads are rolled which makes the molecules of the metal more uniform

The only reason every Head machine seems to use a pilot is to take advantage of the floating table or Spindle head. It’s not magic or Rocket science. It’s saves time. However on a Bridgeport mill if the guide bore is straight up to the spindle by pinning a Rod threw it to a block square on the table...

The best way and simplest way to machine seats on a vertical mill or Bridgeport is bolt/ weld some square bar stock together a rectangle box shape 2” will do. And bolt them to your rotary table standing the table straight up on one end of the table and then bolt a piece of round bar to the other sid...