1:1 - must be an optical illusion...  We did have one of the encoders go 
bad - the shaft to bearing seemed to be glued and just fell apart.  We 
machined the housing of the encoder to add a bearing right at the timing 
pully.  The spindle maxes out at 3000rpm.  (old machine)

sam
On 2/18/2013 5:40 AM, Pete Matos wrote:
> Sam,
>      Hey man thanks for the pictures and videos.  That setup doesn't look
> 1-1 is it just an optical illusion or am I missing something?  It sure
> looks well done this.   What is the spindle Max RPM and does it  take the
> spindle speeds okay?   Apparently it does or you'd have r and r'd it by now
> I am guessing.  Perhaps this is my answer as well....peace
>
> Pete
>
>
>
> On Monday, February 18, 2013, sam sokolik <sa...@empirescreen.com> wrote:
>> that is what we did -
>>
>> K&T spindle encoder with collet unclamp/clamp
>>
>> it works well..  It was about the only place we could fit the encoder
>> without major hacking..
>>
>>
> http://electronicsam.com/images/KandT/conversion/spindle/spindletiminggear.JPG
>> sam
>>
>>
>> On 02/17/2013 10:25 PM, John Kasunich wrote:
>>> On Sun, Feb 17, 2013, at 10:57 PM, Pete Matos wrote:
>>>
>>>> The third option I could go with would be to buy two timing pulleys of
>>>> large diameter and machine one to fit over the approx 3" diameter
> spindle
>>>> body and another of the same diameter that would mount off to the side
> of
>>>> the spindle body and install an encoder wheel on it being a 1-1 belt
> ratio
>>>> that would allow me to track speed as well as use the index pulse on the
>>>> encoder to index for toolchange.
>>> The 1:1 pulley idea is what was done on the Mazak at the EMC workshop.
>>> Worked quite well.  Since the belt is only driving an encoder, it doesn't
>>> need to be very big.  1/4" wide XL belt would be fine.  Maybe even an
> MXL.
>>
>>
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