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goose
07-07-2015, 04:39 PM
I purchased some Delrin rods recently, for projects and prototyping, and will probably not get to using them right away.
So, for long term storage what do you recommend? Are they prone to sagging? The shop can get pretty hot in the summer and air conditioning is not on all the time.

The rods are 3/4" diameter and 4 feet long.

Thank you.

macona
07-07-2015, 06:14 PM
I just have it stacked on a shelf.

cameron
07-07-2015, 06:25 PM
I can't imagine what I would use a 4' Delrin rod for, so I would cut them in half , wrap them up and store them in the bottom of a drawer.

I would expect 3/4" X 4' rod to sag if wasn't supported on a flat surface.

I don't know about Delrin, but white acetal will yellow if exposed to light for long.

Toolguy
07-07-2015, 08:01 PM
I use a lot of Delrin and Acetal. I store them in 4" shipping tubes either standing up or lying down in the material rack. Any plastic will sag over time if not supported. Crooked material is a pain to work with.

boslab
07-07-2015, 08:35 PM
Make a horizontal rack out of 4" or somilar pipe, rod rolls to the bottom, cheap and usefull storage, good for steel and Ali too.
Mark

JRouche
07-07-2015, 10:41 PM
I dont use a lot of it, and ran outta room in my home garage. So... They are just stacked up on end in an available space. The rounds that is, and the smallest diameter is 3/4". The flat stock is in a cubby hole in my storage area on the wall.. JR

http://i1183.photobucket.com/albums/x461/_GLE_/HSM/plastic1_zpsfzhjn8c2.jpg (http://s1183.photobucket.com/user/_GLE_/media/HSM/plastic1_zpsfzhjn8c2.jpg.html)

http://i1183.photobucket.com/albums/x461/_GLE_/HSM/plastic2_zpsap05o9h7.jpg (http://s1183.photobucket.com/user/_GLE_/media/HSM/plastic2_zpsap05o9h7.jpg.html)

wierdscience
07-07-2015, 10:52 PM
JRouche,I am in awe of your Bronze pile sir ;)

J Tiers
07-07-2015, 11:07 PM
JRouche,I am in awe of your Bronze pile sir ;)

Truth.... he looks pretty well set for a while, doesn't he? And not just with the bronze.

Why does bronze have that characteristic spiral?

macona
07-07-2015, 11:14 PM
Truth.... he looks pretty well set for a while, doesn't he? And not just with the bronze.

Why does bronze have that characteristic spiral?

Its from the continuous casting process.


https://www.youtube.com/watch?v=rtp6KPmb370

Lu47Dan
07-07-2015, 11:14 PM
Truth.... he looks pretty well set for a while, doesn't he? And not just with the bronze.

Why does bronze have that characteristic spiral?
Bronze rounds are continuesly extruded, that is what makes the spiral mark on the rod.
Dan.

JRouche
07-08-2015, 12:22 AM
JRouche,I am in awe of your Bronze pile sir ;)

Shhhh.. That is my stash of Concast that is not supposed to be in the pic, they wanted their faces blurred :) JR

achtanelion
07-08-2015, 12:25 AM
JRouche,I am in awe of your Bronze pile sir ;)

Well, I've heard of brass balls, but this is the first I've ever come across bronze piles.

I hope they have an effective ointment for that.

Toolguy
07-08-2015, 12:55 AM
Some of that looks like aluminum bronze...pretty tough stuff. Yes I'm jealous too!
I'm thinking bronze rods should go rather nicely with brass balls.:)

JRouche
07-08-2015, 01:06 AM
Well, I've heard of brass balls, but this is the first I've ever come across bronze piles.

I hope they have an effective ointment for that.

hehee. I do have brass "piles" also so I hope the cream works for both, being copper based and all :)

Back to the plastic though. That stuff is pretty darn tough Goose. In 3/4" x 48" sections I would say keep it tight up on end, as vertical as you can (the heavy cardboard tubes it comes in works great for that). Unless you have extra space to where you can support it along its entire length horizontally.

Keep the metal chips away from it, dust and grime wont hurt it. Stack it away for another day, thats what I do. Oh, and the hot days you get wont do anything unless its unsupported from underneath and it gets bent if horizontal, and that will still take a very long time.

Nothing worse than bent raw materials. I dont have a big space so ALL my round rod over 12-14" gets vertically stacked. Major problem with that? Hard to see what you have and even harder to pull a piece out from behind the forward stacked material.

That is why more shops store bar in horizontal racks, you can get to it. JR

Glug
07-08-2015, 10:05 AM
Fwiw, acetal starts to soften to the point where it will readily take a permanent set at around 170-180F. That is the temp I have used to make permanent dimensional changes to parts machined from acetal rod. Not sure what lower temps could cause changes over longer time frames. Acetal is a semi-crystalline, so it doesn't necessarily behave like traditional plastic, except when it does.

DR
07-08-2015, 11:33 AM
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http://i1183.photobucket.com/albums/x461/_GLE_/HSM/plastic1_zpsfzhjn8c2.jpg (http://s1183.photobucket.com/user/_GLE_/media/HSM/plastic1_zpsfzhjn8c2.jpg.html)

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Nice stock of material to have on hand.

You're problably going to take some heat though because you store your files the way I do.

DR
07-08-2015, 11:41 AM
I purchased some Delrin rods .........................

Thank you.

Acetyl (sp) or Delrin?

Now I'm wondering if the two different materials have much different properties as to sag, etc, etc.

I have noticed less than honest sellers have a tendency to substitute acetal when you order Delrin. Delrin is a more expensive Dupont product with much better quality control in manufacturing. Acetal can be a crap shoot since you may not know of it's origins.

JRouche
07-08-2015, 11:51 AM
You're problably going to take some heat though because you store your files the way I do.

RIGHT :) That is actually my "dead" file pile. They still have a lil life in them though so sometimes its my go to file pile. My good files are stashed. But in reality there is not a problem with the file pile. I dont drag the files off each other. Its a lifting motion, no harm, no foul..

Ummm? I might have to show my file collection some day. Its pretty impressive (all Swiss and American made). I have a hording addiction :) JR

Glug
07-08-2015, 12:42 PM
Acetyl (sp) or Delrin?

Now I'm wondering if the two different materials have much different properties as to sag, etc, etc.


There are two basic compositions for "acetal" - copolymer and homopolymer. Delrin is a brand and it is a homopolymer. In many cases the raw resin or powder is supplied to companies who form it into shapes for sale. The difference between co and poly can be quite complicated, and each has advantages depending on application. There is plenty of info on the topic.

There is great acetal out there that is not branded Delrin. I use Quadrant brand copolymer acetal, and have been very happy with it.

Toolguy
07-08-2015, 12:53 PM
I actually prefer the Quadrant copolymer. The Quadrant Engineering brand is high quality and fairly close tolerance to nominal size.
Both are very similar and most times one will work as well as the other.

JRouche
07-08-2015, 02:39 PM
Yup. Quadrant Acetron GP here as well.. JR

http://i1183.photobucket.com/albums/x461/_GLE_/HSM/acetron%20gp2_zpsvcvuy7hn.jpg (http://s1183.photobucket.com/user/_GLE_/media/HSM/acetron%20gp2_zpsvcvuy7hn.jpg.html)

http://i1183.photobucket.com/albums/x461/_GLE_/HSM/acetron%20gp1_zpsczrccppl.jpg (http://s1183.photobucket.com/user/_GLE_/media/HSM/acetron%20gp1_zpsczrccppl.jpg.html)