Hemingway spindle speed increaser

Hemingway spindle speed increaser

This topic has 4 replies, 3 voices, and was last updated 4 April 2019 at 15:02 by Nick Hulme.

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4 April 2019 at 11:14 #19299
lfoggy
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@lfoggy
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4 April 2019 at 11:14 #403522
lfoggy
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@lfoggy
There was a thread back in 2011 about the spindle speed increaser designed by Dick Stephen and sold as a kit by Hemingway. There was some discussion about limitations of the design but it seems nobody had actually completed one. Has anyone built one since then? I have just started building one and am hoping to use it for slot mills 2mm in diameter. I am not sure how rigid it will be though as it is of lightweight design and relies on just a plain bearing at the top.
4 April 2019 at 11:31 #403529
John Haine
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@johnhaine32865
Will your mill run in reverse?
4 April 2019 at 11:47 #403537
lfoggy
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@lfoggy
Fortunately my mill does run backwards.. i realise this is an issue for some machines.
4 April 2019 at 15:02 #403569
Nick Hulme
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@nickhulme30114
My FB-2 will run in reverse, great for reversing out taps etc. but since the oil pump is a helical screw connected to the motor shaft you wouldn't want to run it in reverse for any length of time.

I built a belt drive speed increaser for engraving and micro-machining, it cost me an afternoon and about £15.
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