Re: [CAD_CAM_EDM_DRO] Air Powered Spindle

The problem isn't that I don't have electricity - but wiring it in. I have air available where the tool will be. The tool has to live on a turret that only turns counter clockwise (cable will get tangled without a rotating fitting) and must be able to function in a coolant rich environment.

--CS

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> Agree they are called high speed grinders not high torque grinders
>it would be very difficult to maintain any given speed better off with
>an inverter setup batteries and a generator. Good luck
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>------ Original message------From: Hannu Venermo gcode.fi@......
>Date: Wed, Oct 15, 2014 10:35 AMTo: C
>AD_CAM_EDM_DRO@yahoogroups.com;Subject:Re: [CAD_CAM_EDM_DRO] Air Powered
>Spindle  I am fairly sure no grinder will run
>1/4" end mills in any metal.
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>Grinders spin fast, with little torque.
>You need the opposite .. slow speed and high torque.
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>It will be a lot easier to run a genset for power, than adapt any other
>strategy, imo, ime.
>Even a few PV panels, batteries and a VFD will work, much cheaper and
>easier.
>Or just a battery-depending on what your restrictions re:electricity are.
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>Air motors of all sorts could be used (these exist, I used to use these
>in the air force as a mechanic).
>They are noisy, inefficient, and very expensive (relatively).
>Think thousands as a start point ..
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>Also, (small and cheap) grinders are usually low power devices.
>A typical air grinder might be 200W.
>You depth of cut might be 0.1 mm or less, at 6 mm wide endmill.
>So for 3/8" or approx 9 mm deep, that would be 90 passes.
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>Maybe need about 2000 l of air, at 10 bars.
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>On 15/10/2014 19:21, 'CS Mo' cs@... [CAD_CAM_EDM_DRO] wrote:
>> Does anyone have any experience using an air die grinder or similar as
>> a high speed spindle? I need to be able to run up to a 1/4" end mill
>> and will only have air available for power - no electricity! I'll be
>> cutting aluminum slots that are ~1/4" wide, 1" long and 3/8" deep. I'd
>> like to be able to cut 1/8" deep per pass, but could live with less.
>> This will be as a live tool on a lathe - no Y control, so I can't
>> effectively use a smaller end mill with a pocket.
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>> --CS
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>--
>-hanermo (cnc designs)
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