How to Remove Blind Roll Pin

"Fred McKenzie" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> << I have a vintage lathe that needs to have the cross slide
> thrust bearing shimmed. I'm not 100% certain, still need
> to get more light on the subject and blow the hole out with
> air, but I think the handle might be mounted with a blind
> roll pin. >>
>
> OD-
>
> Please forgive my ignorance, but what is a blind roll pin? How was it
> installed? Can it come out the way it went in?
>
Yeah, a blind roll pin is installed in a blind hole. You push it in, but
heaven help you if you ever have to remove it. Sorta like those dinky,
doofus axle caps on coaster wagon wheels. They shove on easy, but not made
to remove. Sue Nim describes the roll pin puller, I have a set of them, they
kinda look like a needle file, but one side has rather aggressive barbs. You
push them into the roll pin hole, then gently and squarely pull the puller
out, and, if the stars are correctly aligned and you had an extra bowl of
Wheaties that morning, out comes the roll pin!
Regards,
Tom

Are you able to drive a small drill inside the pin hole ?
If yes, simply drill the handle througn the pin then, from the opposite
side, carefully bore the hole until it reaches the roll pin.
Then use a rod and a hammer to push the roll pin.




"t.hoehler" <(E-Mail Removed)> a écrit dans le message news:
jh8jd.53487$HA.50478@attbi_s01...
>
> "Fred McKenzie" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > << I have a vintage lathe that needs to have the cross slide
> > thrust bearing shimmed. I'm not 100% certain, still need
> > to get more light on the subject and blow the hole out with
> > air, but I think the handle might be mounted with a blind
> > roll pin. >>
> >
> > OD-
> >
> > Please forgive my ignorance, but what is a blind roll pin? How was it
> > installed? Can it come out the way it went in?
> >
> Yeah, a blind roll pin is installed in a blind hole. You push it in, but
> heaven help you if you ever have to remove it. Sorta like those dinky,
> doofus axle caps on coaster wagon wheels. They shove on easy, but not made
> to remove. Sue Nim describes the roll pin puller, I have a set of them,
they
> kinda look like a needle file, but one side has rather aggressive barbs.
You
> push them into the roll pin hole, then gently and squarely pull the puller
> out, and, if the stars are correctly aligned and you had an extra bowl of
> Wheaties that morning, out comes the roll pin!
> Regards,
> Tom
>
>

budgie <(E-Mail Removed)> wrote in message news:<(E-Mail Removed)>. ..
> On Fri, 5 Nov 2004 23:38:04 -0500, "Sue D Nim" <(E-Mail Removed)> wrote:
>
> >Get a roll pin remover. This is not a joke. The tool is a special-nosed
> >punch w/ a sharp edge and in the center of the punch is a point that fits
> >the roll pin exactly.
>
> Errr, it's a BLIND hole. Punching won't do anything helpful.
>
> Drilling may work, but it'll be painful. Drilling a relief from t'other side -
> if practical - sounds the best approach.

If it's a roll pin how about tapping threads into it, inserting a
screw and levering it out?

Grind a special tool if the roll pin permits that is basicly
cylinderical with a small tab on the end to pass down the slot in the
roll pin. Insert twist and pull out the pin??.

Just a thought.

Richard

On 5 Nov 2004 13:52:11 GMT Ol' Duffer <(E-Mail Removed)> wrote:

>I have a vintage lathe that needs to have the cross slide
>thrust bearing shimmed. I'm not 100% certain, still need
>to get more light on the subject and blow the hole out with
>air, but I think the handle might be mounted with a blind
>roll pin. Yes I agree this is a stupid way to build things.

What brand of lathe is it? Something cheap might actually be made like
this, while a real industrial lathe, especially an old one, would be
more likely to be built to be serviced.

Three possibilities come to mind:

Drill out the roll pin with a carbide spade drill.

Drill a hole from the opposite side so that you can drive the pin out.

Check to make see if you can leave the handle attached and remove the
handle with the shaft by releasing something at the other end of the
shaft.

-
-----------------------------------------------
Jim Adney (E-Mail Removed)
Madison, WI 53711 USA
-----------------------------------------------

When I used to do development work on automatic transmissions. the valve bodies
had blind roll pins to hold valves in. To remove them we used allen keys
ground to a point. They were inserted in the pin and turned in the direction
to tighten the roll while pulling the pin out of the hole.

In article <R78jd.53426$HA.1519@attbi_s01>, (E-Mail Removed)
says...
> Sue is exactly correct. You DRIVE the remover in, then carefully and
> squarely PULL the remover out and the roll pin with it. I have pulled a few
> this way, works most of the time. If you have not seen this tool, you might
> have a hard time visualizing this. I got a set from McMaster many years ago,
> like ez outs, they are not a panacea, but they can work in a jam and when
> they do, you stand there just marveling. (at least I do!)

Messages arriving out of order here, as sometimes happens
with UseNet. Anyway sounds like a possibility. Thanks.

In article <(E-Mail Removed)>, fmmc
> Please forgive my ignorance, but what is a blind roll pin?
> How was it installed? Can it come out the way it went in?

A roll pin shoved into a blind hole, i.e. not drilled all
the way through. A stupid way to build anything, in my
opinion, but I guess they didn't figure anyone would ever
need to take it back apart.

> If it is one that can be accessed from one end only, then you should be able to
> screw something into it that will grip it. Perhaps tapping it would allow a
> screw to be inserted, that can then be pulled out.

Maybe... Depends on how hard it is. I've seen them made
from anything from soft cold-roll to hard spring stock.
Sounds like a good chance to break a tap, and then there's
something *really* hard stuck in the hole. Exhaust safer
methods first(?) Thanks.

On 6 Nov 2004 12:10:03 -0800, (E-Mail Removed) (Richard) wrote:

>budgie <(E-Mail Removed)> wrote in message news:<(E-Mail Removed)>. ..
>> On Fri, 5 Nov 2004 23:38:04 -0500, "Sue D Nim" <(E-Mail Removed)> wrote:
>>
>> >Get a roll pin remover. This is not a joke. The tool is a special-nosed
>> >punch w/ a sharp edge and in the center of the punch is a point that fits
>> >the roll pin exactly.
>>
>> Errr, it's a BLIND hole. Punching won't do anything helpful.
>>
>> Drilling may work, but it'll be painful. Drilling a relief from t'other side -
>> if practical - sounds the best approach.
>
>If it's a roll pin how about tapping threads into it, inserting a
>screw and levering it out?

My experiences with roll pins is that they are under significant "radial"
compression force. I really can't envisage that working, but hey in 40-odd
years of engineering I've seen many surprises.

>Grind a special tool if the roll pin permits that is basicly
>cylinderical with a small tab on the end to pass down the slot in the
>roll pin. Insert twist and pull out the pin??.

I've rarely seen that slot present in a correctly sized roll pin when inserted.
Same surprise caveat as above.

On 07 Nov 2004 00:45:27 GMT (E-Mail Removed) (WbSearch) wrote:

>When I used to do development work on automatic transmissions. the valve bodies
>had blind roll pins to hold valves in. To remove them we used allen keys
>ground to a point. They were inserted in the pin and turned in the direction
>to tighten the roll while pulling the pin out of the hole.

That's an interesting technique and I'm glad to hear of it, but those
must have been spirol pins, not roll pins. The latter only go around a
little less than once, so they aren't "directional."

-
-----------------------------------------------
Jim Adney (E-Mail Removed)
Madison, WI 53711 USA
-----------------------------------------------

How about spot welding a ring to the pin and simply yanking it out?


--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"

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