1983 P lathe and circular polishing?

[willbrooks]

Since we are on this topic... one thing I've never understood about lathe lines is how on the 1996 obverse (here is a 96D example) the lines are somewhat far apart at the coin's outside edge... but if you look at the reverse lathe lines on a 1996 (here is a 96D reverse example) they are closer together.

Yes. Curious how the obverse die lines are all so drastically different than the reverse die lines. What does that tell you?

[VAB2013]

Yes. Curious how the obverse die lines are all so drastically different than the reverse die lines. What does that tell you?

Well Will... I was hoping that you would answer that question! But... it leads me to think that the obverse lines are in fact lathe lines and the reverse lines are not. The only stumbling block that I have is the reverse lines are strong and symmetrical on many examples as opposed to light and broken on others that we know are from die polishing.

Also... it could be that the actual lathe lines get closer together toward the center of the die.

[willbrooks]

Well Will... I was hoping that you would answer that question! But... it leads me to think that the obverse lines are in fact lathe lines and the reverse lines are not. The only stumbling block that I have is the reverse lines are strong and symmetrical on many examples as opposed to light and broken on others that we know are from die polishing.

Also... it could be that the actual lathe lines get closer together toward the center of the die.

Perfect analysis. Both possibilities. Now where do you go from here?

[VAB2013]

Perfect analysis. Both possibilities. Now where do you go from here?

Now ladies and gentlemen... I would like to turn the floor over to Will Brooks, Die & Design Expert, LCF Glossary Author and Author of numerous Coin World articles, just to mention a "few" of his recent accomplishments!

(while I go brew another pot of coffee and try to think harder on this one) LOL! Thank you Will!

[VAB2013]

Will... I would like to mention this. The reverse lines on the example shown on errorvariety.com at "AM" are significantly closer together than they are on the obverse example.

Coffee is ready!

[willbrooks]

Now ladies and gentlemen... I would like to turn the floor over to Will Brooks, Die & Design Expert, LCF Glossary Author and Author of numerous Coin World articles, just to mention a "few" of his recent accomplishments!

(while I go brew another pot of coffee and try to think harder on this one) LOL! Thank you Will!

No no no. I am busy right now. You got this. Time to fly, little birdie.

[VAB2013]

No no no. I am busy right now. You got this. Time to fly, little birdie.

LOL Will, you crack me up! You're not too busy... you are just getting my brain to stretch a little bit more!

Okay... little birdie says... considering the fact that the die is cone shaped it seems to me that any lathe lines that may have been left in the center of the die (not polished smooth before hubbing) would be obliterated during the strike, leaving only the outside edges of the lathe lines visible. Therefore, if that is correct, what we are seeing on the reverse of these examples is actually from die polishing with a rotary tool. I would think that rotary tools are used so inconsistently, at different angles, with different pressures, with new brush attachments and old attachments, that a new brush held at a consistent angle, with consistent pressure in the same spot, could produce these concentric lines that we are seeing on the reverse and they are not lathe lines.

now... little birdie just flew out the window

[willbrooks]

LOL Will, you crack me up! You're not too busy... you are just getting my brain to stretch a little bit more!

Okay... little birdie says... considering the fact that the die is cone shaped it seems to me that any lathe lines that may have been left in the center of the die (not polished smooth before hubbing) would be obliterated during the strike, leaving only the outside edges of the lathe lines visible. Therefore, if that is correct, what we are seeing on the reverse of these examples is actually from die polishing with a rotary tool. I would think that rotary tools are used so inconsistently, at different angles, with different pressures, with new brush attachments and old attachments, that a new brush held at a consistent angle, with consistent pressure in the same spot, could produce these concentric lines that we are seeing on the reverse and they are not lathe lines.

now... little birdie just flew out the window

Who was it that said I am building an army?

[VAB2013]

Who was it that said I am building an army?

It was Jon! Here, post #46!

[VAB2013]

Who was it that said I am building an army?

So... Will... I guess I got part of it correct and you have an article in the works so you can't talk about it right now. That is a statement and a double question

[willbrooks]

So... Will... I guess I got part of it correct and you have an article in the works so you can't talk about it right now. That is a statement and a double question

No. I am struggling with organization of the MMS4/9 article. You pointed out how the striations article didn't flow right either. 2 steps forward, 1 step back = progress.

[VAB2013]

No. I am struggling with organization of the MMS4/9 article. You pointed out how the striations article didn't flow right either. 2 steps forward, 1 step back = progress.

Okay... gotcha! You are working on the SF MMS-004 and MMS-009 article! Then you are busy and these articles are starting to stack up on you! Sorry I doubted your word about being busy earlier!

[makecents]

Holy cow what happened here while I was gone!! Viv and Will figuring out all the worlds problems while I'm just working my butt off dealing with a dumptruck full of stupid at work today! So, in a nutshell, we have the little bird flying off becoming a big bird and the big bird with a full plate. Does that cover what I missed here?

[VAB2013]

Holy cow what happened here while I was gone!! Viv and Will figuring out all the worlds problems while I'm just working my butt off dealing with a dumptruck full of stupid at work today! So, in a nutshell, we have the little bird flying off becoming a big bird and the big bird with a full plate. Does that cover what I missed here?

I think you have it all covered Jon, sorry you had a dump truck full of stupid to deal with today! And... sorry I busted into your thread, I didn't anticipate all of this happening.

Really and truly... I don't think Will is ready to talk about this... not sure how off track I am... so guess we have to wait and see (flying away again.....~~~~

[makecents]

I think you have it all covered Jon, sorry you had a dump truck full of stupid to deal with today! And... sorry I busted into your thread, I didn't anticipate all of this happening.

Really and truly... I don't think Will is ready to talk about this... not sure how off track I am... so guess we have to wait and see (flying away again.....~~~~

Don't worry about the dump truck load of stupid, that's what I do, it was just a little worse than normal today..... Nothing the Eggnog won't take care of Re-watching the Soprano's and that helps a lot too! Will will be alright, he's a Big Bird, hah! I do know he has a lot on his plate and really appreciated him taking time to look at this coin though, he knows that too or he would not have done it. You can take over my post anytime Viv, you are my Ambassador and teacher and will always bow to you!