Gallery, Projects and General > How do I??

the best method to get out the Centre bit

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lordedmond:
Ok the problem I have a 5 inch disc 1 inch thick of en1a and I need to get the middle out ( its not critical dimension wise say 3.5 inches )


I have a lathe thats ML super 7  , a SX3 mill with 6 inch rotary table

The bit I need is the bit that is like a polo mint  :D so I can drill the middle to clamp it down on the rotary table


Before you ask its for a flywheel rim and the tube that I can get hold of is to thin


Stuart

Jasonb:
Stitch drill all round just inside of the line you want that way you get to use the bit in the middle for something else and should just be able to clamp it to the R/table which saves drilling a cental hole.

Once its drilled out put it in the lathe to finish off

picclock:
You may have already thought of this. Centre rotary table under head (I use a dti magnetically attached to the spindle). Lock the axis. Loosely clamp outside of disc to rotary table as near as you think is correct. With dti attached to mill table and rotary table on free rotate  by hand to find high spot and tap it with a soft hammer . Repeat until disc is centred.

With practice I've found I can centre 131mm discs (to better than 0.5 thou) in less time than its taken to type this.

Hope this helps  

picclock

lordedmond:

--- Quote from: Jasonb on March 28, 2011, 11:24:14 AM ---Stitch drill all round just inside of the line you want that way you get to use the bit in the middle for something else and should just be able to clamp it to the R/table which saves drilling a cental hole.

Once its drilled out put it in the lathe to finish off

--- End quote ---


Thanks for the input its going to take a lot of drilling , but hey I forgot to mention I have time as well as tools  :)

JimM:
Not the most elegant way but could you use a holesaw to remove the centre portion then use the RT and mill for clean up. Only suggest this as I've got a cheapy marketstall  holesaw set that I picked up when installing some downlighters and not yet found a use for the other sizes  ::)

Cheers

Jim

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