Re: [CAD_CAM_EDM_DRO] (unknown)

docholliday01201 wrote:

> A general machining question if you don't mind.
>
> Over the last three years I have completely worn out the
> sherline milling machine. Over the last one year I have developed
> the CNC conversion to its fullest degree on this machine. However
> over three years of use the X axis ways are completely destroyed. As
> well the machine is quite small for what I wish to do. So I find
> myself browsing for a new machine.
>
> Two general options come to mind: one would be a full-size
> used Bridgeport milling machine, or Bridgeport clone. Which I would
> slowly convert to servo based CNC controls, likely using gecko
> drivers,EMC , and servo motors purchased from Ebay. The other
> options is one of the Chinese benchtop milling machine's. What I do
> not understand is the functional difference between a gear head
> machine, versus a belt driven machine. For equivalent hp ratings
> there appears to be about $300 difference between equally equipped
> machines.

Note that the lowest speed on a Bridgeport 1J head is 80 RPM.
Can the Chinese machine go that slow? You may need it for
flycutting or use with a boring head.

Second, the Bridgeport has 5" of quill travel. Many of the smaller
machines have 3.5 - 4", and you'll really miss that last inch!

Jon