@rbtdanforth, I was happy to see you use “light ply” for the Amazing Labyrinth Coaster. So many of the designs are for medium weight woods, of which I have very, very little. But I do have quite a bit of light ply. So thank you! I wish more of the catalog designs were made to be used with light ply.
Cool! The medium weight plywoods have MDF in the middle and I hate MDF. In point of fact as there are no limits for any of the coaster designs as you can just use the official cutting schedule for that material. Or the schedule you have worked out for any non-pg materials.
The exception is the Grabber. That has to be real plywood. I made some doubles out of some left over Medium Maple and they broke easily. I designed a mirror set for those cases of one sided materials you can put the pretty part on both sides.
Light ply was only introduced recently. Many designs were posted long before it was offered.
I was not able to post designs until light plywood arrived and much of the first stuff I did post were from the introductory stuff discount that I purchased when it was introduced.
The first ‘light’ ply I saw was in 2018, I was doing a ‘Save the Date’ fridge magnet for my daughter’s wedding and used their new 1/4" ply. I was amazed when the one in medium ply was heavier than the 1/4". I figured it must have a Balsa core or something.
Seriously? It was that long ago? I was one of the folks helping to test out the different settings for it and thought it was only a couple of years ago.
Proofgrade Light ply was introduced by Glowforge in October '21. The catalog had been around quite some time prior to that.
Whew! I thought I might be slipping down the reduced faculties slope.
I need to get some light ply to make designs for light ply.
It is barely thinner than medium ply, but weighs a lot less and as it is all real wood stronger than medium.
Ok, I’m not losing my mind either.
These are examples of what they were selling as thick’ ply and medium. Note the date, the engraving occurred well before that. The piece out of focus is the thick sample.
The ‘thick ply’ is 0.183, and the medium sample is 0.123.
The thick ply weighed 11.9 g, the medium was 12.9. Just holding one in each hand got your attention.
They had thick and medium from the beginning, it’s the light ply that was introduced in late 2021.
My point was that the wood was super lightweight, they called it ‘thick’ but it had the same core as what is now ‘light’.
I did not know this and only found out about the time the Light ply was introduced so did not buy PG before that.
I know the light ply is much newer, so didn’t expect the older patterns to be made in it. I just want more of the newer additions to the catalog to be made with it.
I had no idea the core of the medium was mdf. I just kinda figured plywood, whatever kind or thickness or where it’s purchased, whether pg or big box stores, was all wood. I thought ply just meant it was layers of wood glued together to make the thickness, whereas mdf is more of a wood pulp glued and pressed together. Shows how little I know!
That will depend on the designer. I personally wouldn’t be running out to buy light ply for new designs just because it exists. I can’t see any benefit. The weight of these objects is rarely of concern, and proofgrade medium cuts perfectly on a fully-functional machine.
I personally use 5/32" Columbia Products ply more than anything else.
I knew that the medium was MDF, and thought the thick was too. I would have purchased a lot more thick if I had known.
As soon as you apply Hand sanitizer to MDF it dissolves that glue as well and you are back to a pile of sawdust. I had a work desk made of it that was cleverly hidden so I did not know it until I had it for a year or so and it kept dissolving on all the edges for the rest of the time I had it. The used it a lot on the floors here as underlayment at it is dissolving over time as well. Did I ever explain why I really hate MDF?
Before that I had Oak ply that was 5mm and Revolution ply that is about 4mm but is good on only one face and not near as strong, but the least expensive available per sq ft.
I think the basswood was always thinner
You can buy wood core plywood or MDF core plywood. I like MDF because the side burn is nice and dark consistently. Wood core tends to show the layers of the ply, since the color is lighter than MDF
Thick has always been their 1/4" … the majorty of 1/4" calipers to .21 not .25
Medium has been their 1/8" … calipers at .12 not .125
So we always knew a Light was probably coming. I just got some light ply, and am going to caliper it. I’m guessing it will come in at 3/16"