Re: [CAD_CAM_EDM_DRO] Aluminum cutting,,,,,,,

YES....I would definitely miss the slow speeds! Thanks for the feedback but
I think I'll leave well enough alone, since I don't have any pressing work
that would require high speed machining.

Smoke

>One way to get a bit more speed is to install a variable frequency
>drive, which synthesizes 3 phase AC changing the voltage and frequency
>as necessary to make the motor run at different speeds. Usually you
>can run them substantially above the nameplate speed of the motor. A
>side benefit is that if you get a unit rated about twice your motor
>horsepower, you can use it is a solid-state phase converter and plug
>it into single phase.
>
>However you might need a better quality motor (rated for inverter
>duty) if you want to run faster than 60hz a lot. You also may need
>better spindle bearings.
>
>A simpler method would be to double the speed of your mill by
>substituting a 3450 RPM motor for the likely 1725 RPM one on there.
>Concern about spindle bearing life remains, and you may miss the low
>speeds...
>
>Chris
>
>> And how do I go about doing that...without rebuilding the entire drive
>> head...and would the cost be worth it?
>>
>> This machine is a 3HP vary-speed (speed adjusted thru a crannk) 9 x 49

mill.

>> A Chinese "knock off" of a Bridgeport.
>>
>> Smoke
>>
>>
>>
>> >Smoke wrote:
>> >
>> >> Max speed on my mill is only about 3200 RPM and I think I'll pass on
>> using
>> >> an 1/8" end mill when surface finishing a 5"+ wide piece or cutting 1"
>> plus
>> >> groove widths.
>> >
>> >Well, up to the max RPM on your spindle, the interesting thing is that a
>> large
>> >end mill doesn't actually allow higher feed rates, at least for

finishing.

>> >I used to think that you needed really big end mills to remove a lot of
>> >metal quickly, but finally figured out that a small end mill, turning

fast,

>> can
>> >remove metal FASTER, given that fairly small depth of cut and chip load
>> >will be used. Yes, when carving out big cavities or grooves, then the
>> >larger tools do better, but when finishing on the side of the cutter,

the

>> >smaller tools can spin faster, therefore more teeth per minute, so you
>> >can feed faster. The limit, of course, is the length of cut. The small
>> >end mills will deflect or chatter on the longer cuts, while the larger
>> tools
>> >will stay rigid.
>> >
>> >Jon
>> >
>> >
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>
>
>--
>Christopher C. Stratton, stratton@...
>Instrument Maker, Horn Player & Engineer
>22 Adrian Street, Somerville, MA 02143
>http://www.mdc.net/~stratton
>NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT
>
>
>
>
>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

>
>Addresses:
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>
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