| Hi
Well kind of, the compound slide really should only be used if your cutting a short tapper on a bar. This is due to the uncertainty in re setting the compound after a tapper cut. In treppaning the forces can also be very high and the lead screw on the compound is not as befy as the rack on the saddle.
On small trerppaning jobs the compound would be fine. i once had the job of treppaning two hundred small parts from large diameter brass bar. the idea being it would save the cost of more bar stock. This was done using the compound with no problems.
The T rings were treppaned using a purpose ground too that had the radius of the cut ground on both faces (good old Quorn cutter grinder). The saddle is used to feed the tool in at a very low feed. the job needs lubrication more than coolant so Rockol was used in buckets full. Due to the tool being almost 5/8 inch long the machine speed was dropped to 36RPM.
The tool does look like a parting off tool just with a curve in the blade. The trick if there is one is to ensure that the tool dosnt dig in and rip the work out of the chuck, or off the face plate. For these I used a 12 inch face plate and bolted the billets down in six places with a rubbing block on the core so it wouldnt drop away once the cuts joined up in the middle of the billet. The tool was ground from 5/16 stelite as there was no call for carbide.
For any one thnking about cast aluminum T's I would recomend this method the wheels are solid and the rivetts took very welll through the spokes.
I have to say i really like the look of your little single cylinder oscilator. Nothing beats enginuity and that one has it in heaps nice litle engine.
kevin |