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polymer concrete
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In a message dated 10/19/2002 1:08:22 PM Central Standard Time,
scotr@... writes: I've been lurking on and off on this list for a year or so and I wasScott: Yes! See if you can chat with THIS ol' boy: volzmechatronic@... Jan Rowland |
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Scot Rogers
Hey there list,
I've been lurking on and off on this list for a year or so and I was wondering if anyone out there has done any research into Polymer concrete castings for machine bases. I have a CMS GT Sprint cnc lathe and the base is made of the stuff. It's actually really neat stuff. It has all of the good quaities of real stone and vibration & dampening charactheristics that are up to 30 times stronger than conventional materials. I.E. Steel & Granite. My main objective is to find out the most common ingredients and proportions for mixes that would be good for small scale industrial machine bases. Any info would really help. I want to play around with the stuff. Thanks in advance, Scot |
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Was discussed extensively a year or so back. I would suggest taking a
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dive into the archives. Remember that each search is only a small segment of the archives and you have to keep hitting previous to go back in time. Getting no items found only means in the segment you are searching and not in the total archive. Tim [Denver, CO] -----Original Message----- I consider this as a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ |
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Scot Rogers
On Saturday 19 October 2002 11:25 am, you wrote:
Thanks Marv, I spent 3 hours looking on the internet last night for suppliers of the stuff and all I could find was the companies that actually do the casting and moldmaking. I really appreciate it. Scot Scot, |
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Marv Frankel
Scot,
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Try this web site: . It was one I got for casting leadscrew nuts, but I noticed they also had materials for casting machine bases. Marv Frankel Los Angeles ----- Original Message -----
From: "Scot Rogers" <scotr@...> To: <CAD_CAM_EDM_DRO@...> Sent: Saturday, October 19, 2002 10:59 AM Subject: [CAD_CAM_EDM_DRO]polymer concrete Hey there list,is made of the stuff. It's actually really neat stuff. It has all of thegood quaities of real stone and vibration & dampening charactheristics that areup to 30 times stronger than conventional materials. I.E. Steel & Granite.My main objective is to find out the most common ingredients and proportionsfor mixes that would be good for small scale industrial machine bases. Anyinfo would really help. I want to play around with the stuff.aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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William Scalione
Here's a nice machine made with polymer concrete.
Bill Hey there list,is>made of the stuff. It's actually really neat stuff. It has all of >the good quaities of real stone and vibration & dampening charactheristics >that are up to 30 times stronger than conventional materials. I.E. Steel & Granite. My main objective is to find out the most common ingredients andmachine >bases. Any info would really help. I want to play around with the stuff. Thanks in advance, |
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Brian
Hi, well i am no expert but the machine i saw being built they poured the
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urethane/concrete like material into the machine once it was at the customers site. Then final scraping and set-up was done. The material was a base of Urethane, stone powder and some type of emulsion binder to keep the viscosity even till it was set-up. The small piece i had didnt bounce when tossed to the floor but more of a flap-n-thud sound. You really couldnt damage it with a screwdriver..go to a place where they use those materials and ask to see how it is used. Maybe they will tell you who's material they use. cul brian f. ----- Original Message -----
From: "Scot Rogers" <scotr@...> To: <CAD_CAM_EDM_DRO@...> Sent: Saturday, October 19, 2002 1:59 PM Subject: [CAD_CAM_EDM_DRO]polymer concrete Hey there list,is made of the stuff. It's actually really neat stuff. It has all of thegood quaities of real stone and vibration & dampening charactheristics that areup to 30 times stronger than conventional materials. I.E. Steel & Granite.My main objective is to find out the most common ingredients and proportionsfor mixes that would be good for small scale industrial machine bases. Anyinfo would really help. I want to play around with the stuff.aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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William Scalione
Hi, well i am no expert but the machine i saw being built they poured thea base of Urethane, stone powder and some type of emulsion binder to keepthe viscosity even till it was set-up. The small piece i had didnt bounce whenthey use. cul brian f.Brian, Was the machine base basicly a hollow form made of steel, or cast iron? What I'm trying to figure out is, if it would be possible to build a small machine base out of 1/2" thick aluminum or steel plate, bolt it together, and then have it machined to be square and true. Once everything is done, fill it full of the polymer concrete, and bolt THK style rails to the frame. Seems like if this could be done, we could come up with a design for the group and have a bunch of the frame parts made and sold as a kit. Looks like it would make a nice machine, Desktop size, maybe 8 X 12 working envelope. It would look like this No idea what it would cost to have something like that done Bill |
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Brian
Hi bill, well the base of the machine after filling with polycrete weighed
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just over 10 tons. it was a welded structure with rounded gussets and several layers of open bottom drawers so to speak. bottoms smaller than top. They poured up to the first level, vibrated to remove air, then secured a polyethelene faced door with a strap clamp, moved the pour up to the top. each time they got to a door it was closed and sealed the same way. The box rails without ways on top were supported evenly with gusseted framework. part of the reason for this fancy design was so the whole head assembly could rest on the framework untill the pour cured. then the head was lifted, the box top was scraped and the ways set. head was lowered onto the ways. Looking and thinking about that design i see no reason why a very light frame could be made and after pouring setting rails like thompson makes should be quite easy. I do not know the price of the stuff tho, Less Watts should tho!?! for small stuff even if the rail was just iron, and ground and scraped after casting should be super stable...A printing co. i worked for used to set iron and brass castings at a seasoning yard out in the weather for about 3 years, sometimes more just because of supply or demand. I bought a new unseasoned casting and used it for a boat anchor for 4 years, then they asked if i still had it, needed a casting to build one more machine. yep its a machine now..even when seasoned, it still can move around when being machined..if the body of the machine is a cured casting on a frame it would be hard to move, good stability even if you machined it!!! cul brian f. --Original Message -----
From: "William Scalione" <wscalione@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, October 20, 2002 3:50 PM Subject: Re: [CAD_CAM_EDM_DRO]polymer concrete theHi, well i am no expert but the machine i saw being built they poured wasurethane/concrete like material into the machine once it was at the awhenbase of Urethane, stone powder and some type of emulsion binder to keeptheviscosity even till it was set-up. The small piece i had didnt bounce materialstossed to the floor but more of a flap-n-thud sound. You really couldnt frame.and ask to see how it is used. Maybe they will tell you who's materialtheyuse. cul brian f.Brian, Seems like if this could be done, we could come up with a design for thelike it would make a nice machine, Desktop size, maybe 8 X 12 working envelope.aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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Doug Harrison
Some "experts" claim that machine bases must be cast with quartz fill
whereas others say granite is the only choice. The one thing nearly all agree on is that the resin content should be between 5-10% of the total mass. Now for a caveat. The vast research done by Philly and a few others is not without merit. Those who build ruling engines and diamond turning machines benefit from this knowledge base. It's just not applicable to a hobby machine with rolled ballscrews and ABEC1 bearings. Spectral and thermal response of the base is the least of problems here. Start with a true 100% solids epoxy and add your choice of moisture free stone fill. Again, some claim fine powder is best and others say a variety of powder and agregate sizes should be used. At $50 a gallon (10.5 pounds) for epoxy you get up to 200 pounds of casting mix. With filler you should have about thirty cents a pound in the mix. That's about the price of steel. Doug |
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