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Posted by Joseph Gwinn on July 1, 2008, 9:06 am
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From "Re: Continuing lathe chatter (from people now, not the lathe)"
posted 4 June 2008 by Joe Gwinn:
> > >> >> Mine may not be truly equivalent, since mine has three belts
> > >> >> applying stress to the side of the shaft. But I get what feels like
> > >> >> a
> > >> >> 3:1 or perhaps 4:1 ratio of starting force vs moving force. It
> > >> >> pegged
> > >> >> the force gage which I was able to find -- at about 1.5 KG applied at
> > >> >> a
> > >> >> point 3.125" from the center (on a chuck jaw at the OD of a 6-1/4"
> > >> >> chuck.)
> > >> >
> > >> > Ah! That sounds exactly how it now feels like when turning the
> > >> > spindle
> > >> > by hand. It sounds like I did not over-tighten it.
> > >>
> > >> O.K. Note that when I had the spindle out to change belts, I
> > >> tightened it until it fit the manual's spin test. But after using it a
> > >> while, it developed chatter. I had to go back, overtighten the collar
> > >> on the back, and then loosen it and re-tighten it after I had set the
> > >> bearings properly. :-)
> > >
> > > Hmm. I may have to do much the same, as the spindle bearing was
> > > probably too loose for years, and may need to re-adjust to its new
> > > circumstances.
> >
> > Perhaps -- but I think that I simply didn't pre-tighten over the
> > spin test point, when I should have. A bit of use pushed the bearings
> > deeper into their mounts.
>
> I perhaps may see the same effect. The bearings in my 5914 may well
> have walked a tad out of their mounts, and will now walk right back,
> under pressure.
This does seem to be happening, and rather quickly at that. It has
become noticeably easier to turn the spindle by hand. I don't plan to
do any adjusting just yet, instead waiting to see how much it will
loosen by itself.
Joe Gwinn
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Posted by DoN. Nichols on July 1, 2008, 9:02 pm
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> From "Re: Continuing lathe chatter (from people now, not the lathe)"
> posted 4 June 2008 by Joe Gwinn:
[ ... ]
>> > Perhaps -- but I think that I simply didn't pre-tighten over the
>> > spin test point, when I should have. A bit of use pushed the bearings
>> > deeper into their mounts.
>>
>> I perhaps may see the same effect. The bearings in my 5914 may well
>> have walked a tad out of their mounts, and will now walk right back,
>> under pressure.
>
> This does seem to be happening, and rather quickly at that. It has
> become noticeably easier to turn the spindle by hand. I don't plan to
> do any adjusting just yet, instead waiting to see how much it will
> loosen by itself.
O.K. I wound up the second time over-tightening it, and then
loosening it until it spun the proper amount.
Good Luck,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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Posted by Joseph Gwinn on July 2, 2008, 9:01 am
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> > From "Re: Continuing lathe chatter (from people now, not the lathe)"
> > posted 4 June 2008 by Joe Gwinn:
>
> [ ... ]
>
> >> > Perhaps -- but I think that I simply didn't pre-tighten over the
> >> > spin test point, when I should have. A bit of use pushed the bearings
> >> > deeper into their mounts.
> >>
> >> I perhaps may see the same effect. The bearings in my 5914 may well
> >> have walked a tad out of their mounts, and will now walk right back,
> >> under pressure.
> >
> > This does seem to be happening, and rather quickly at that. It has
> > become noticeably easier to turn the spindle by hand. I don't plan to
> > do any adjusting just yet, instead waiting to see how much it will
> > loosen by itself.
>
> O.K. I wound up the second time over-tightening it, and then
> loosening it until it spun the proper amount.
I will no doubt do much the same, as I learn how much is correct.
I now have a radial-pin spanner wrench that fits and is large enough, so
precise adjustment should be easier. But not until it settles a bit
more.
Joe Gwinn
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Posted by DoN. Nichols on July 2, 2008, 8:23 pm
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[ ... loose spindle bearings ... ]
>> O.K. I wound up the second time over-tightening it, and then
>> loosening it until it spun the proper amount.
>
> I will no doubt do much the same, as I learn how much is correct.
I did pretty well by feel on that the first try.
> I now have a radial-pin spanner wrench that fits and is large enough, so
> precise adjustment should be easier. But not until it settles a bit
> more.
Oh -- you didn't have the pin spanner before? You could turn a
piece of stock bored large enough to slip over the ring and then drill
it for a pin which you could slip in. Or you could press fit the pin,
and then saw out about 270 degrees worth of the ring. :-)
I was lucky to be able to pick up a proper pin spanner at one of
the for-sale tables at the local metalworking club meetings.
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
|
|
Posted by Joseph Gwinn on July 3, 2008, 9:28 am
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>
> [ ... loose spindle bearings ... ]
>
> >> O.K. I wound up the second time over-tightening it, and then
> >> loosening it until it spun the proper amount.
> >
> > I will no doubt do much the same, as I learn how much is correct.
>
> I did pretty well by feel on that the first try.
>
> > I now have a radial-pin spanner wrench that fits and is large enough, so
> > precise adjustment should be easier. But not until it settles a bit
> > more.
>
> Oh -- you didn't have the pin spanner before? You could turn a
> piece of stock bored large enough to slip over the ring and then drill
> it for a pin which you could slip in. Or you could press fit the pin,
> and then saw out about 270 degrees worth of the ring. :-)
I did consider making a spanner, but decided to get an Armstrong wrench
with swinging arm, that will handle a range of sizes.
> I was lucky to be able to pick up a proper pin spanner at one of
> the for-sale tables at the local metalworking club meetings.
I have a large collection of random pin spanners, but none fit well, and
the ones that did fit were too small and weak.
Now that I bought a wrench, the perfect one will came along for $0.50.
Joe Gwinn
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> > >> >> applying stress to the side of the shaft. But I get what feels like
> > >> >> a
> > >> >> 3:1 or perhaps 4:1 ratio of starting force vs moving force. It
> > >> >> pegged
> > >> >> the force gage which I was able to find -- at about 1.5 KG applied at
> > >> >> a
> > >> >> point 3.125" from the center (on a chuck jaw at the OD of a 6-1/4"
> > >> >> chuck.)
> > >> >
> > >> > Ah! That sounds exactly how it now feels like when turning the
> > >> > spindle
> > >> > by hand. It sounds like I did not over-tighten it.
> > >>
> > >> O.K. Note that when I had the spindle out to change belts, I
> > >> tightened it until it fit the manual's spin test. But after using it a
> > >> while, it developed chatter. I had to go back, overtighten the collar
> > >> on the back, and then loosen it and re-tighten it after I had set the
> > >> bearings properly. :-)
> > >
> > > Hmm. I may have to do much the same, as the spindle bearing was
> > > probably too loose for years, and may need to re-adjust to its new
> > > circumstances.