Re: [CAD_CAM_EDM_DRO] Re: VFD Selection

I'm willing to recieve such info of list if you can't get up load to
work. I'd prefer that everybody get the chance to see your unit.

I've been slowly collecting materials to build some machinery. The
thought right now is for a gantry type machine with several head that
could be attached. THe ER collet extension idea is really starting to
look good to me, so seeing other ideas would be very helpfull. I've
taken many a spindle apart over the years so I have some idea as to how
they work. For high speed routing I'm thinking that one could get by
with cheap components.

Thanks
dave


Henrik Olsson wrote:

>Dave,
>I made a spindle from one of those. It's an ER16 collet chuck. I didn't use
>angular contact or tappered roller bearings, just standard good quality
>bearings, two of them, of course.Then a smaller one at the top end. I made
>'rings' with a tight pressfit together with loctite to hold the bearings in
>place and to space the two lower bearings apart. The bearings are then
>slightly preloaded by pressing the outer rings together with a flange. It's
>driven by a 1100watt (overkill, but that's what i had) 3-phase motor via
>beltdrive and a VFD.
>
>When I put it togeher I locked the bearings with locktite and got the
>preload a little high, I think. So when run at 10.000 rpm for an hour or so
>it got pretty hot. So a friend of mine made a 'cooler' for it out of a piece
>of alumium extrusion.
>
>This is not a optimal design but it works in aluminum and other 'soft'
>metals. And it's pretty cheap.
>
>I was going to upload a photo or two of it but I cant find the upload button
>or the create folder button on Yahoo any more. I'll send them to you off
>list if you like.
>
> /Henrik Olsson.
>
>
>----- Original Message -----
>
>
>>This brings up a question about an idea I have had floating around in my
>>mind for some time. Has anyone attempted to build a spindle out of
>>one of those "ER" extensions. A long one of course, seven or eight
>>inches may allow enough space for a set of bearings and a drive pulley.
>>
>>Just a thought that has been rolling around in my head for some time
>>now. Since these are normally built to reasonably tight tolerances I
>>could see this as being feasable for both a plain bearing spindle and a
>>ball bearing supported spindle. An ER extension can be had for around
>>$100 dollars which is not a bad price considering what a full blown
>>cartridge spindle would cost.
>>
>>Thanks
>>Dave
>>
>>
>
>
>
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