Measurement request

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skiprat

skiprat

Passed Away Mar 22, 2022
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Hi all,
I would like to make or have made, a comprehensive set of pin chucks for making closed ended pens and caps.

Please would you do me the favour of measuring the inside diameter of various tubes that are popular. If you don't have calipers a snug fit drill bit size will do. Metric or imperial. Even the bush size will help.

I don't want to start an accuracy fight, so please would you e-mail me your favourites. Please let me know the length of the tube, whether it's the cap or body, and the name of the pen.
We don't have access to the same varity of kits that you guys do, or I would do it myself.

Also, if you have a preference, what method would you use to hold the chuck? Like collet chuck, scroll chuck, morse taper etc.

Many thanks in advance:D
 
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Beall collet chuck is my preferred method to hold pin chucks.
I can take measurements from the following pin chucks when I get home if you'd like.
Gentleman's: top/bottom
El Grande: top/bottom
Baron: top/bottom
Perfect Fit: top only
 
I would think Beall also will be best if possible. If not, I think a Jacob's chuck will do just fine.

Another favorite closed end is Jr. Gent/Statesman version II. I'll see if I can email you measurements for those tonight.
 
An idea I have been bouncing around is to use the Beall to hold the Harbor Freight punches, into which I've ground a flat for holding the pin. I bought a set for this purpose, but haven't gotten enough shop time to give it a try, or even to determine how straight they are.
 
LOL...I plan on doing the same Jim! And I swear I am not copying you this time.

Like you, I haven't had the chance to try the idea yet.
 
Originally posted by JimGo
<br />An idea I have been bouncing around is to use the Beall to hold the Harbor Freight punches, into which I've ground a flat for holding the pin. I bought a set for this purpose, but haven't gotten enough shop time to give it a try, or even to determine how straight they are.
Click to expand...

Been planning on making pin chucks myself. I just might have to copy you and Dario.
 
Sorry Steven, but I'd have to know you a little bit better before responding to your request for measurements! [}:)][}:)][;)][;)]

Or I'd at least want a monetary offer to be on the table for my consideration! [:p][:p][:X][:X]
 
Originally posted by angboy
<br />Sorry Steven, but I'd have to know you a little bit better before responding to your request for measurements! [}:)][}:)][;)][;)]

Or I'd at least want a monetary offer to be on the table for my consideration! [:p][:p][:X][:X]
Click to expand...

Oh Angela, if only we were single. I have read between the lines and now know that your measurements are what dreams are made of.[:p]

PS. do you take Pounds?[}:)]
 
Originally posted by skiprat
<br />
Originally posted by angboy
<br />Sorry Steven, but I'd have to know you a little bit better before responding to your request for measurements! [}:)][}:)][;)][;)]

Or I'd at least want a monetary offer to be on the table for my consideration! [:p][:p][:X][:X]
Click to expand...

Oh Angela, if only we were single. I have read between the lines and now know that your measurements are what dreams are made of.[:p]

PS. do you take Pounds?[}:)]
Click to expand...

No pounds, don't know the conversion rate[:)]. But I'll trade in pen kits[:p], nice pen blanks[:p], new tools[:p], etc...[:X][:X]
 
Sorry, I forgot about this.

The tube inside measurements that I got for Jr Gent II are:

0.474" approx = 12.04 mm
0.384" approx = 9.75 mm
 
Dario: I have been gathering measurements of pen kits for my Pen Reference Chart. My figures agree with yours to 0.001" for the lower tube. But there is a large difference for the upper tube. Could you double check your measurement, please.

Please post the OD and the ID. In looking at the measurements I have to date for all kits, the ID is generally 16-18 thousandths less than the OD. I'll not post the measurements I have, so you won't be influenced. Thanks.
 
These are the measurments from the pin chucks Alan(?) made for me.
Measurements done with a HF digital caliper.
Gent cap: .5485-.550 there is a slight step up to .551 where the rod mounts into whatever you might be holding it in.(as I recall, this is a decent fit on the tube.)
Gent body/Baron cap: .433 (good fit)
Baron Body (somewhere in the mess, I'll have to get it later.)
EG cap: .494 (ok fit, maybe just a slight amount too loose, very slight.)
EG body: .4505 (ok fit, also maybe just a slight amount too loose.)
Perfect fit cap: .318 (also just a little loose for my taste.)
 
For folks thinking about using someone else's measurements for building your own pin chucks or anything else for that matter, do be careful and give serious consideration to how much variance you can stand in the dimensions. I have some measurements that have been given to me or posted on the Internet for the hardware that Bill listed. Some of the measurements are almost identical and others vary quite a bit. Bill's may be accurate, mine may be accurate, or neither or both??

Just want to make the point that these measurements should be taken as useful starting points; but people should probably take their own measurements to eliminate possible sources of variation. I will put my figures in red after the ones posted by Bill so the comparison will be easy.


Originally posted by bjackman
<br />These are the measurements from the pin chucks Alan(?) made for me.
Measurements done with a HF digital caliper.
Gent cap: .5485-.550<b>(0.555" measured tube ID)</b> there is a slight step up to .551 where the rod mounts into whatever you might be holding it in.(as I recall, this is a decent fit on the tube.)
Gent body: .433<b>(0.434" measured tube ID)</b> (good fit)
Baron cap: .433<b>(0.436" measured tube ID)</b> (good fit)
Baron Body: <b>(.0.365" estimated from tube OD)</b> (somewhere in the mess, I'll have to get it later.)
EG cap: .494<b>(0.492" est, from tube OD, 0.493" from bushing size)</b> (ok fit, maybe just a slight amount too loose, very slight.)
EG body: .4505<b>(0.456" est. from tube OD, 0.452" from bushing dia.)</b> (ok fit, also maybe just a slight amount too loose.)
Perfect fit cap: .318<b>(0.311" from bushing dia., 0.321" est. from tube OD)</b> (also just a little loose for my taste.)
Click to expand...
 
Randy - There is commonly a rebate along the length of several of my pin chucks. They need to be at close tolerance only at the ends. The rebates are machined into the AZ Sil compression chucks too.
 
Ken; I'm not familiar with the term "rebate" as used by machinists. Could you explain exactly what that means?

I had intended to make a comment in my earlier post to the effect that I don't know how snug pin chucks are supposed to fit the tubes. I can understand that they probably don't need to fit to the last thousandth; but I'm guessing they don't want to be off by 10 thou either.
 
Originally posted by Randy_
<br />Dario: I have been gathering measurements of pen kits for my Pen Reference Chart. My figures agree with yours to 0.001" for the lower tube. But there is a large difference for the upper tube. Could you double check your measurement, please.

Please post the OD and the ID. In looking at the measurements I have to date for all kits, the ID is generally 16-18 thousandths less than the OD. I'll not post the measurements I have, so you won't be influenced. Thanks.
Click to expand...

Randy the original measurement was verified to be correct for the tubes I used.

I got a fresh set and this is what I got (and see the discrepancy).

0.464" and 0.383"

I am not sure if the difference is due to the fact that I have some spare tubes. Could the spares be made elsewhere? BTW, I am not even sure if the ones I originally measured are spares, just throwing a possible scenario/explanation.
 
Originally posted by Dario
<br />.....I got a fresh set and this is what I got.....0.464" and 0.383".
Click to expand...

Thanks, Dario. The figures I have are 0.467" and 0.385". The match is a lot better for your second set of measurements. There is always going to be a little variation on this measurement as measuring tube IDs is a little tricky.
 
Jim: That is exactly what I did originally. But after a little practice, i found i could get just a accurate a measurement by making a direct ID measurement. Other problem is that if you use the 2X method, any error in the measurement of the wall thickness is doubled so the final result will be even more inaccurate.
 
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