Machining Hemispheres on milling machine

Practicing machining KL Axle bearing in aluminium before attempting bronze. There seems to be an error somewhere as they are a few thou out of round.

Category:

Autos & Vehicles

Tags:

• milling
• rotary
• table

[LongIslandEddie]

i'm impressed! This is the stuff of machinist's dreams, a challenge, a chance to use your own brain instead of some automatic shit that cuts you out of the formula for success. This ingenuity is what America was once about and sadly, we're so "advanced" in today's world markets that even the common layman wouldn't know enough to get by if we entered a new dark age, a day when survival meant quick and logical thinking in a situation where only mechanical skills will get you by. Nice setup, guy...

[gettuff2]

The errror is created by the tool disc centre not bisecting the centre of the machined cavity. Unless you can get the tools revolving centre and disc centre at the centre of the cavity it will not cut true. In other words you cannot cut a perfect half circle with this method. It can be done on a shaper though!!

If you mount your rotary table in a vertical position and make a tool that is fixed to the table that pivots in a suitable arc and whose length is the desired dia to be cut and whose..

[normanmj]

OSHA would love to visit that place.

[AunShovah]

Wow is all I have to say

nice setup

[rakker16mm]

@CreazioniPinnacolo

The math is not all that hard, so you won't be that far along making chips. In fact I'd say it takes just as long to set a CNC mill or lathe to do the same job. CNC lathe would be the best option, but at the end of the day you will have to do the job with the tools you have or send it down the street.

I've used this method myself and it works very well.

[rakker16mm]

@gettuff2

A full hemisphere is easily done once you work out the math. I have used this method on several occasions to cut perfect hemispheres for high pressure tanks. When set up properly it yields incredibly accurate results.

[MICMECMEXICALI]

there must be a connection betwen machinist, my father built a similar tool, wiith motorcycle gearboxes,a drill, also he cast her own aluminium with her home build foundry, all kind of modification to the lathe, even the universal machinist lathe with a car gearbox to change the head speed, good bless al the real machinist that build the tools and machines with out an uneversity degree just her machinist brain.

rip Mr salvador Alvarez Martinez a machinist from the old school

[CreazioniPinnacolo]

@LongIslandEddie and while hes racking his brain and doing math, ill be making money do the job for less and faster with my cnc... any good machinist that can program can do the same thing on a manual setup

[HospY1000]

well done!

[MaCaHoliC52]

Ha Ha, I made a similar set-up with a rotary table and an old milling machine power feed, used a cogged belt to drive it, and the power feed had a rheostat on it to control speed. Got some wicked backlash from the rotary table so I had to keep the locks on half way. We were doing something similar only in acrylic,, man that was a tricky job.

Cool, and I thought I was the worlds greatest machining genius for dreaming it up,,good going we now have a power feed rotary table club going,,

[bmq05]

Wow that is amazing. That there takes a lot of knowledge and skill.

[levisalo]

That is a seriously cool set-up. Great improv, I like it!