On Sunday 11 October 2009, Mark Cason wrote:
> On my 7x12 (Sieg C2 style), the mounting plate for the chuck is an
>integral part of the spindle, as shown here:
Humm, I believe you are correct. TBT its been years since i had the 3 jaw
mounted, the scroll was junk in the replacement 4" I bought for it, plus its
so easy to center up something in the 4 jaw, that I have never felt the urge
to switch it back.
> Three studs/nuts hold the chuck to the lathe. There is another set of
>holes for mounting a 4 jaw, that shares one hole with the 3 jaw (6 holes
>total). I think of it more like a poor mans version of a D1-4.
I remember that now.
>only concern with braking resistors, is making sure that the part that
>is being held does not get slung out of the machine. I've been toying
>with the idea of using some 1/4" Lexan to surround the machine, so I can
>use flood coolant. I'm also hoping that it will contain any minor
>mishaps inside, instead of exploding across the shop.
> (My drawing/programming skills are very poor right now)
>> To change the subject a wee bit, does anyone have a link to someone
>> selling prefabbed optical pieces
> Do you mean like this?
Yes, but more likely a combined unit since space is a bit limited in there.
I've even considered demolishing an old ball type mouse, and setting one unit
on a slant to read as phase A and index, & the other to read phase B, if the
gap is wide enough to take that piece of 16 gauge alu I made it from.
Those mice are now almost collectors items, I bet I've tossed 10 of them out,
broken cables & what not. But that does start another train of thought here.
> I have two treadmill motors, 120VDC - 1100 watts, that I had
>considered using, but they both have the rotation listed as CCW. I
>haven't taken them apart, but I'm assuming they both have angled brushes
>that allow them to run in one direction. Are yours the same way?? If
>so, how well do they work when turning backwards?
>Oh, and Peter, I forgot to mention, your bunny multiplied...
>Ne M'oubliez ---Family Motto
>Hope for the best, plan for the worst ---Personal Motto
>(='.'=) This is Bunny. Copy and paste bunny into your
>(")_(") signature to help him gain world domination.
>On 10/11/2009 11:53 AM, Gene Heskett wrote:
>> On Sunday 11 October 2009, Kirk Wallace wrote:
>>> On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>>> ... snip
>>>> A far at the pair of 50's is concerned, they will also stop it fairly
>>>> quickly. Mine is maybe 2 or 3 turns from the full 2500 rpms, and some
>>>> might call that a little brutal, but I have been doing it for at least
>>>> a year with no ill effects that I have detected. A single 50 would
>>>> probably be fast enough, and certainly easier on the PM fields of the
>>> That brings to mind, my Hardinge has a screw style chuck mount which
>>> seems like Russian roulette when using aggressive decelerations.
>> That might depend on how heavy it is, and how tightly it locks into home
>> when it is installed. Certainly a 50 pound or more chuck, unscrewed and
>> still spinning 1900 rpms, could do a lot of damage to both the person and
>> the equipment. My chucks are smaller of course, and normal change is to
>> unbolt them from a face plate, but that face plate is still screwed to
>> the spindle at whatever size thread is on a 7x12's spindle. I believe I
>> took it off once but don't recall now how I managed to get it loose as
>> there is not a ready method to lock the spindle in that little machine.
>> That thought does beg for some method of locking it onto the spindle nose
>> though, and one that would not effect the accuracy of the mounting, so
>> set screws are probably out. As is double nutting, no space for the
>> inner nut.
>>> An A5
>>> spindle is on my wish list.
>>> Another thought, for DC spindle motors, I've done a bench setup with a
>>> tread mill motor and Jon's PWM drive. With a minor modification, it
>>> worked very well. With its four quadrant feature, I suppose it could
>>> allow some axis capability. If one needs a new DC (or universal) drive,
>>> this could be a cost effective way to get one. Plus you don't need to
>>> monkey with an analog signal.
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