know anyone who can fix this or does this type of service?

[werowance]

You should make one from spun brass like goldstar31 mentions in his post. It really is not hard to do.

I would turn a Wood plug the shape of the inside of the “cups” leaving a nice “handle for later mounting in your lathes chuck.

The fact that there is a hole in the Center is perfect for screwing a small lag bolt thru a hole in the brass disks.

Before spinning anneal the brass disks by heating them red hot and quenching them in water.

Chuck up your wooden form with a brass disk bolted on it in your lathe.

Spin it up at a relative slow speed, a few hundred rpm will suffice. Using a heavy (say one inch) dowel with its end rounded, begun in the Center working your way out pressing the dowel against the disk.

Just keep on moving from Center to edge over and over shaping the disk to the form a little more each pass.

You may be able to clamp the dowel to the lathes compound and use it to get a better purchase on it.

It’s just like forming the end cap for a model boiler.

BTW -Are you sure it is a milk shake machine and not a cocktail shaker?

I’ve come across a few different designs of them from the 1920’s and 1930’s. They usually held two glass shakers with plated brass tops.


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Here is a video of something similar. This person is using what appears to be a polished metal bar to shape the metal disk:

thanks, I havnt seen the actual machine, just the cups. as for antique or not as mentioned by goldstar, I really cant say. just that a friend wanted my help and that its valuable to him so its important enough for me to want to help him if I can.

but using a wooden dowel for the spinning tool? what do you think about a small ball bearing on a pice of 1/2" square stock in the tool post as the spinning tool? what those guys do in the youtube videos is really nice. even if I cant make his cup for him I want to give spinning a try some day.

 

[goldstar31]

I studied Pelmanism which is a form of memory training. Write it down if you usually forget things
There is a quite marvellous series of ancient magazine articles called Popular Mechanics and by good fortune remains on the net.

So Google it for 1934-when I was beginning to learn engineering and probably page 952 and there is a brilliant article on metal spinning.
So what have you to lose?

I would exercise caution on another article on making skis, but that is not the question, is it?

Cheers

Norman

 

[werowance]

thanks goldstar, I do read the PM magazine a lot on google. ill have to look that issue up.

so I have to ask, Making Skis? bad experience?

 

[goldstar31]

thanks goldstar, I do read the PM magazine a lot on google. ill have to look that issue up.

so I have to ask, Making Skis? bad experience?

Well, I was vice chairman of the British Norwegian Ski Club and my late wife was Membership Secretary and one winter there was little or no snow here----- and we decided to increase the membership.
So I have 4 wonderful but terribly expensive grandchildren now!

Best wishes in your efforts.

 

[BaronJ]

Hi Werowance,

Trying to use rigid tools in the toolpost won't work very well ! You need to be able to feel the material moving and thus control its behaviour.

Use tools and rests similar to the ones that you have seen in the vids. The ball race on the end of a bar is fine, as is a polished face.

A common lubricant for brass and alloys is soap or wax.