Re: Great deals on encoders

to: CAD_CAM_EDM_DRO@onelist.com

Thanks for the additional homework on
this one. It sounds like these motors/encoders will be good deals for
their intended application (rotary) only. Thats just fine, but I think
I'll go for the finer resolution of the 360 cpi linear strips. I may go
ahead and order a few for rotary use as well, as the 4th axis needs
degrees anyway. My intended application for the DRO are all old worn
lead screw equipped machines (at this point - ballscrews when I'm ready,
which with this list may be sooner than I first thought :-)

Brad Heuver
Mechanical Sub-Systems fax 734-523-6052
734-52-33480 bheuver@...
*** Reply to note of 07/14/99 12:54
=========================================================================
From: "Tim Goldstein" <timg@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Date: Wed, 14 Jul 1999 10:55:25 -0600
Subject: Re: [CAD_CAM_EDM_DRO] Great deals on encoders

From: "Tim Goldstein" <timg@...>

The encoders are HEDS9100-A00 model.

From HP's web site:The HEDS-9000 and HEDS-9100 are designed for use with
codewheels which have an optical radius of 23.36 mm and 11 mm respectively.
The HEDS-9200 is designed for use with a linear codestrip.
The full data sheet is at
http://ftp.hp.com/pub/accesshp/HP-COMP/motion/heds9000.pdf

I just talked with the tech people at US Digital and the answer appears to
be that by design and specification it will not work, but they have never
tried it and think that if the correct LPI strip was used it may be
functional. His calculations are that it would use a strip with 183.8 +- 10%
LPI. So the best resolution would only be about .0015

Based upon the +-10% he thinks the stock 200 LPI strip may work.

Tim
[Denver, CO]

----- Original Message -----
From: Brad Heuver <bheuver@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Wednesday, July 14, 1999 6:49 AM
Subject: [CAD_CAM_EDM_DRO] Great deals on encoders


> From: Brad Heuver <bheuver@...>
>
> to: CAD_CAM_EDM_DRO@onelist.com
>
> Tim, from your comments, and inferring from Andy's, the $4 motor/encoder
> combo uses a HEDS 9100 encoder which will work with a 360 count linear
> strip from US Digital, effectively saving $27 per encoder. Am I
> interpreting your results correctly? Did you only test the rotary disc
> on the motor? I have not really checked out the specs on the 9100
> encoder, but need to purchase a few for my DRO, and if I can save the
> $$, I'll certainly do so. Thanks for the confirmation, and let me know
> if I'm reading more into your note than I should...
>
> Brad Heuver
> Mechanical Sub-Systems fax 734-523-6052
> 734-52-33480 bheuver@...
>
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