Re: Bridgeport power knee lift

I'm installing the HF z-axis unit now (purchased it 12+ years ago).
I'm installing it for the same reasons, just too much work to crank.
From looking at the other links below, the Enco's are longitudinal
feed units. I have the servo unit purchased through enco. Pricey
(about same price as 15 years ago), as I have a Wells-Index mill. For
a few more $s they sent an simple to install kit customized for my
mill, good instructions (only complaints with the Servo brand is, very
small control range on the .9 turn potentiometer from off to, too
fast, it does not have any feed back velocity control for the selected
setting, also it is not controllable for a very slow feed rate). As
for the HF unit, it has the Bridgeport shaft adapter included (I did
not see this pictured in any of the other Z-axis links). It is for a
shaft end that has 3/4"x16 threaded end for the "crank engage "pawl"
nut. This adapter is machined to fit over the 5/8" shaft where the
crank handle would be. Looks like you thread this onto the Bridgeport
shaft, and drill and pin it. It also comes with a stand that will
mount on the machine, that the power feed then mounts too. Also has
hardware for the limit switch install. In all pretty complete kit of
components. I'm making a whole new shaft from the bevel gear out, it
will mimic the Bridgeport shaft arrangement.
Looking at the 150 inch pound vs 135 in. lbs. unit, the motors are
universal (meaning they can run on DC or AC power) but the control
electronics are SCRs and require AC power to work. The 150 in.lbs.
unit is full wave, where the 135 in. lb. is half wave. This makes the
low end speed control sloppy on the 135 in.lb. units.

Anyone out there have an improved controller design or links to
someone who has worked out a nice control circuit?

As for the draw bar. I made a new one that used a 3 inch diameter by
2 inch long cylinder of steel round stock. I lightly knurled this.
This serves as my Nut that I drive by hand to tighten the R-8 collets,
I use a throw out bearing from my 1981 Datsun B210 clutch. I have
never had the R-8 tooling slip with hand tightening. I made a whole
new drawbar shaft from 7/16" O2 drill rod, At the top of the spline
drive I made a replacement thrust nut much larger to accommodate the
throwout bearing diameter.

Ignator

On Apr 18, 8:21 pm, F. George McDuffee <gmcduf...@mcduffee-
associates.us> wrote:
On Wed, 18 Apr 2007 23:48:14 GMT, "Tom Gardner"

see
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=42749
http://cgi.ebay.ca/150-LBS-Z-AXIS-TRAVEL-POWER-FEED-BRIDGEPORT-MILLIN...
http://www.use-enco.com/CGI/INSRIT?PMAKA=307-3695&PMPXNO=8741200&PART...
http://www.use-enco.com/CGI/INSRIT?PMAKA=205-6411&PMPXNO=3227509&PART...
http://marketplace.soyfeed.com/Grinders/New-150-lbs-z-axis-travel-pow...
http://bbs.homeshopmachinist.net/showthread.php?t=12609&page=2
google on <z-axis power-feed bridgeport> about 2500 hits


.

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