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I'm in need of help finding a part for my bench top mill , RF45 clone
. It's the same as the Grizzly G0484 and they show the part as
discontinued . I'm looking for a replacement X axis lead screw nut . The >Grizzly part number is P0484032 , maybe someone is making a replacement
since there must be 10's of thousands of these machines around . The
thread is Acme 15/16 (24 mm) diameter with an eight TPI thread . I've
seen articles about people making replacements using plastic - maybe
ABS? - and heat/pressure forming the threads but I'd lots rather find a >direct drop-in replacement .
I'm in need of help finding a part for my bench top mill , RF45 clone
. It's the same as the Grizzly G0484 and they show the part as
discontinued . I'm looking for a replacement X axis lead screw nut . The >Grizzly part number is P0484032 , maybe someone is making a replacement >since there must be 10's of thousands of these machines around . The
thread is Acme 15/16 (24 mm) diameter with an eight TPI thread . I've
seen articles about people making replacements using plastic - maybe
ABS? - and heat/pressure forming the threads but I'd lots rather find a >direct drop-in replacement .
Yup , that's what it looks like . But I don't know what pitch the
threads are ... They don't all use 8 TPI , some use 10 .
On Tue, 19 Nov 2024 17:27:05 -0600
Snag <Snag_one@msn.com> wrote:
I'm in need of help finding a part for my bench top mill , RF45 clone
. It's the same as the Grizzly G0484 and they show the part as
discontinued . I'm looking for a replacement X axis lead screw nut . The
Grizzly part number is P0484032 , maybe someone is making a replacement
since there must be 10's of thousands of these machines around . The
thread is Acme 15/16 (24 mm) diameter with an eight TPI thread . I've
seen articles about people making replacements using plastic - maybe
ABS? - and heat/pressure forming the threads but I'd lots rather find a
direct drop-in replacement .
Maybe Jet has something. Their JT9 and JMD45 mills look similar:
https://jettools.com/jmd-45gh-geared-head-square-column-mill-drill
Manual link to pdf on that page has a parts section.
This might be the part you're looking for but you won't like the price😬
https://jettools.com/table-nut-jmd18-223a
 I'm in need of help finding a part for my bench top mill , RF45
clone . It's the same as the Grizzly G0484 and they show the part as discontinued . I'm looking for a replacement X axis lead screw nut . The Grizzly part number is P0484032 , maybe someone is making a replacement
since there must be 10's of thousands of these machines around . The
thread is Acme 15/16 (24 mm) diameter with an eight TPI thread . I've
seen articles about people making replacements using plastic - maybe
ABS? - and heat/pressure forming the threads but I'd lots rather find a direct drop-in replacement .
On Wed, 20 Nov 2024 09:25:37 -0600
Snag <Snag_one@msn.com> wrote:
<snip>
Yup , that's what it looks like . But I don't know what pitch the
threads are ... They don't all use 8 TPI , some use 10 .
Guessing by the part Description Size "TM23.7-10" it's likely to be
10 TPI. Of course that 10 could be meant as Metric I suppose. No
clue as to how Metric is specified in relation to our TPI meaning...
Just an off the wall thought... could you use Babbit and a home brew
mold to catch the pour for a shape you could use?
"Joe Gwinn" wrote in message >news:7a9qjjds38pts5ul6mi564k9i7pm3gr0fr@4ax.com...
Delrin works well for thermally forming a nut on an existing metal
leadscrew. There are many you-tube videos.
Joe
-------------------------------
Generic acetal cold-formed to sharp points when I knurled it.
On 11/19/2024 4:27 PM, Snag wrote:
  I'm in need of help finding a part for my bench top mill , RF45
clone . It's the same as the Grizzly G0484 and they show the part as
discontinued . I'm looking for a replacement X axis lead screw nut .
The Grizzly part number is P0484032 , maybe someone is making a
replacement since there must be 10's of thousands of these machines
around . The thread is Acme 15/16 (24 mm) diameter with an eight TPI
thread . I've seen articles about people making replacements using
plastic - maybe ABS? - and heat/pressure forming the threads but I'd
lots rather find a direct drop-in replacement .
Would have responded sooner, but I do not have a proper Usenet client installed on the house computer.
My first response would also be to sleeve the existing nut. This
addresses your request. I would suggest very tight sliding fit and use sleeve and bearing locker.
The search for a new one is what it is. A search. I have no special insights other than as you clearly already know that these machines may
be sold under different labels. I suggest may be ask Matt at Precision Mathews. Admittedly he may be more responsive on parts to a customer
than somebody who just wants parts, but he is very good at supporting customers.
Now for the tangents.
Backlash should not be a huge issue if your gibbs are adjusted, you use
your gibb locks, and you mostly conventional mill. Accuracy probably is
not a huge issue, but if it is take all measured moves using the hand
wheel dials in only one direction. If you really need to be able find a postion accurately in two directions there are two solutions. The nice
one is a DRO with glass scales. The alternative is some dial indicators mounted to the table. I have a dial indicator mounted semi permanently
on one of my lathes.
As was already mentioned ABS is a terrible idea for all the reasons
stated. Acetal (Delrin is a trade name) is used for bearings, axis
nuts, and a variety of other things. Its pretty tough and there are commercial products made form the stuff. HOWEVER. Acetal does not
accept any common adhesive well at all. It would not be a good option
for boring and sleeving the old nut. Bronze or even brass would be better. I do not know if adhesives would stick to oilite bronze. Maybe another rabbit hole to research there.
I looked. I do not have an acme tap that big. You will have to cut it
on your lathe (or buy a very expensive tap) after grinding a suitable
inside cutting tool. It will probably chatter pretty bad, so it might
be time to consider making a solid tool post that bolts directly to the
cross slide.