Hole cutter

[Alan Waddington 2Participant @alanwaddington2]

Posted by vintage engineer on 12/01/2019 20:41:22:

I would drill a hole down one side and use a bandsaw to cut out a 3" billet then bore the rest out.

Not saying it couldn’t be done, however i once made a pair of motorcycle fork yokes from 1 -3/4” ally plate and used a bandsaw to rough them out, straight cuts ………it was slow and hard going, tried dry at first, but then used WD40 and eventually paraffin as a lube, but even then the blade clogged constantly, wouldn’t fancy the job through 6” on such a tight radius.

[Stephen RowleyParticipant @stephenrowley13300]

Thank you all for all you comments. I have had a email from a local company who say they can water jet cut 6" and have offered to do it for cost so I am off there first thing Tuesday.

The restoration of these projector is something I have been at for 18 years. These 2 projector were installed in the cinema by my farther in 1958 so they have a very big personal conection as apart from 2 old photos they are all I have of my farther.

Steve

[FMESParticipant @fmes]

For what you are doing I would have been looking at getting the sections cast in ally first and then boring / machinig out the small amount remaining.

Regards

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