Subject: Re: Asian lathe change gear bearings.

From: "Steven O. Smith" <[email-masked]>
Date: Wed, 4 Dec 1996 16:21:53 GMT

Bruce Holder wrote:
> 
> w.j.ward ([email-masked]) wrote:
> : I would like to cut left-hand threads on my little Taiwanese lathe, but I
> : have to reverse the feed screw.  I think I could do that rather easily, but
> : I would need to obtain one of the change gear bearings.  This is a keyed
> : bushing of about 1cm in diameter.  I don't know how to machine such a part,
> : since the key protrudes out from the bushing.  It must have been molded.
> : Has anyone else been able to get these parts?

All you folks having the same problem tells me I'm missing something,
could somebody explain?

All I do to cut left hand threads on my lathe is to reverse the lead
screw. How come you need special parts?

-- 
Steven O. Smith
[email-masked]

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From: [email-masked] (Ole-Hjalmar Kristensen FOU.TD/DELAB)
Date: 04 Dec 1996 18:32:22 GMT

In article <[email-masked]> "Steven O. Smith" <[email-masked]> writes:

   -- 
   Steven O. Smith
   [email-masked]

You are missing that some cheap lathes do not have a facility for
reversing the leadscrew.  My AT-300 comes to mind.... There is lots of
backlash, so I thought I would make some new ones with a better fit,
or add an extra nut as a backlash adjuster. Should be simple enough to
make a special tap by threading some drill rod or similar on the
lathe, yes? No. The leadscrew is lefthanded, so I need to reverse it
in order to make a lefthanded thread. No facility to reverse the
leadscrew. I am thinking about modifying the "banjo" to accept an
extra idler wheel, but haven't got around to it yet.

Ole-Hj. Kristensen

---

From: "w.j.ward" <[email-masked]>
Date: 3 Dec 1996 01:21:38 GMT

I would like to cut left-hand threads on my little Taiwanese lathe, but I
have to reverse the feed screw.  I think I could do that rather easily, but
I would need to obtain one of the change gear bearings.  This is a keyed
bushing of about 1cm in diameter.  I don't know how to machine such a part,
since the key protrudes out from the bushing.  It must have been molded. 
Has anyone else been able to get these parts?
-- 
God ==> Man ==> State

W.J.Ward, Redford Twp., Michigan

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From: [email-masked]
Date: 3 Dec 1996 15:28:22 GMT

In article <[email-masked]>, "w.j.ward"
<[email-masked]> writes:

>-

It may well be the same as the parts on a Jet lathe. Try Jet as they seem
to carry a good range of spares for their lathes. Their prices on spares
are good too. If you can't find a phone number give a yell and I will go
looking for you on my PhoneDisk CDs.

Peter

---

From: [email-masked] (Peter Brooks)
Date: 6 Dec 1996 19:06:09 GMT

Speaking of 1mm gears (and reversing small lathes):

1) first, there's an article in one of the VP books on doing this for the
9 x 20 lathe.  Check the faq.  I think the author is E.T. Feller.  He
made his own gears, though.

2) My Browning catalog doesn't do metric.  Does Boston have metric
change gears, or if not, can someone recommend a source?  I'd like to do
a few odd threads, and a 25 tooth gear would come in handy.

Pete Brooks

---

From: [email-masked] (Peter Brooks)
Date: 6 Dec 1996 21:04:24 GMT

Steven O. Smith ([email-masked]) wrote:

: All you folks having the same problem tells me I'm missing something,
: could somebody explain?

: All I do to cut left hand threads on my lathe is to reverse the lead
: screw. How come you need special parts?

You're not missing something; the lathe is.  No reverse for the lead screw.

Pete Brooks

---

From: James Askew <[email-masked]>
Date: Sun, 08 Dec 1996 11:53:07 -0800

Jens wrote:
> 
> tony <[email-masked]> wrote:
> 
> >Gee, an incapable taiwan special? How could that be?
> >The way some guys rave about their Orient express bargins. You shouldn't have this
> >problem. Molded parts? Oh, I guess that idler gear to reverse
> >the lead screw was an option the dealer/importer/freight fowarder didn't tell you about.
> >did tell you about.
> >
> >Somehow I've never had this problem on a S/Bend or Logan.
> ><Sarcasm mode ended>
> >Why not try running the spindle in reverse and threading with the tool upside down?
> >Does the lathe have the reverse option?
> 
> Here we go again with the thread on imports .....
> groan .....
> 
> Jens

That will not work!!  I will make right hand threads.  The lead screw
must be reversed with respect to the spindle.

Jim

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From: [email-masked] (Scott Logan)
Date: Sun, 08 Dec 1996 20:37:26 GMT

>Does the lathe have the reverse option?

That won't help, you'll still be cutting a right hand thread, just
upside down and backwards.

Scott Logan
[email-masked]
www.loganact.com

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From: tony <[email-masked]>
Date: Fri, 06 Dec 1996 19:10:21 -0500

---

From: [email-masked] (Jens)
Date: Sat, 07 Dec 1996 14:05:52 -0800

Jens

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From: [email-masked] (Bruce Holder)
Date: 9 Dec 1996 20:35:59 GMT

Peter Brooks ([email-masked]) wrote:

: 2) My Browning catalog doesn't do metric.  Does Boston have metric
: change gears, or if not, can someone recommend a source?  I'd like to do
: a few odd threads, and a 25 tooth gear would come in handy.

  My 1994 Boston Gear catalog describes metric spur gears as a special
order item. They have a minimum order of 25 pieces for parts under 6"
OD. I never worked up the courage to ask for a quote.

  Peter, I'll lend you my 25 tooth gear if you'll ream the bore out to
a true 14 mm before you send it back.

Bruce

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From: [email-masked]
Date: 10 Dec 1996 17:01:56 GMT

In article <[email-masked]>, [email-masked]

>a true 14 mm before you send it back.

I assume this *is* a lathe gear. Why not bore it out yourself?

As for gears try...

Stock Drive Products
Ph (516) 328-3300

Peter

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From: [email-masked] (Peter Brooks)
Date: 11 Dec 1996 18:47:00 GMT

Bruce Holder ([email-masked]) wrote:

:   My 1994 Boston Gear catalog describes metric spur gears as a special
: order item. They have a minimum order of 25 pieces for parts under 6"
: OD. I never worked up the courage to ask for a quote.

Ouch!  Hmm, there's a fastener place around here called "Mr. Metric".  Wonder
if he sells change gears, too?

I think I'll pass on the special orders.

:   Peter, I'll lend you my 25 tooth gear if you'll ream the bore out to
: a true 14 mm before you send it back.

Hmm, this leaves me in more or less the same position.  Got a 25/33 tooth
metric gear from the surplus shop, and I could easily turn off the 33
tooth portion, but I'll have to bore out the hole to fit my lathe.  Might
have to make up a special spindle, too, since a 25 tooth gear is a very
small gear for the standard spindle, and there may not be enough metal
to cope.  I think I better take a look at some other alternatives.....

Thanks,

: Bruce