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  #1  
Old 03-17-2018, 01:05 AM
Chris Lowry Chris Lowry is offline
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Grinding machine

My wife is doing these murinni fused pieces. When they are done we need to grind about 1/16” to 1/8” off the whole surface. As they get bigger we are having a harder time.

We have been using a large 36” rociprolap but it really doesn’t work with pieces over 20”.

If money wasn’t holding you back how would you grind them?

I’ve seen some cool granite surface grinders, they are supper expensive and I don’t even know if they would work.

Any advice would be appreciated.
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  #2  
Old 03-17-2018, 07:20 AM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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So its a 20” flat surface? Talk to someone who makes grave stones or stone counter tops- maybe they can do the rough grinding and you finish on the recip?
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Old 03-17-2018, 08:25 AM
Eben Horton Eben Horton is offline
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I’d go with a hand held angle grinder. There are zero size restrictions if you go hand held.
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Old 03-17-2018, 11:39 AM
Chris Lowry Chris Lowry is offline
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We want to start making them 36” or more... so yes big ass flat surface.

What do grave stone makers use to grind? Any personal experience with such tools?

Hand held angle grinders are interesting but I haven’t had much luck with the surface quality. Diamond grinders always leave scratches would love to use loose grit. I have a tornado disk for my right angle and that thing is so slow it would take days.

I saw a guy who built an attachment to mount his right angle grinder onto. This arm would keep the grinder flat so he could move it all over the piece without digging edges. I liked the idea just not the grinding plates. I wonder if you could build an upside down loose grit grinder on a floating arm. Then you could move the grinder instead of the piece.
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Old 03-17-2018, 11:55 AM
Rick Wilton Rick Wilton is online now
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Z bavelloni makes huge CNC machines that will cut glass or stone, polish the edges, and grind down the top surface perfectly flat. even grind in " V " groves like old China cabinets.

http://www.bavelloni.com/en/centri-d...ollo-numerico/
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Old 03-17-2018, 12:31 PM
Chris Lowry Chris Lowry is offline
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Wow, love it. Funny the website talks about the size of the overall machine but not the size of the working surface. I would need a new studio too.

Anyone have any experience with a machine like this?
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  #7  
Old 03-17-2018, 12:33 PM
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A used blanchard would be my machine of choice but a decent sized one with a 100 or greater inch swing is a large tool. Jon Kuhn used a blanchard on all his big optics. You're talking serious money for a new unit as in 100K or more.
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Old 03-17-2018, 12:44 PM
Rick Wilton Rick Wilton is online now
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I operated one for a short time years ago. They vary in size but the one I used would hold a 6 foot x 9 foot sheet of glass easily.
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Old 03-17-2018, 01:24 PM
Chris Lowry Chris Lowry is offline
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So a Blanchard has a spinning table and a spinning head, cool. What type of head for glass? Loose grit maybe? You would have to add water and rust protection but way cool.

What about something like this

https://www.parkindustries.com/stone...izard/#content

The CNC seems like a dream but we would have to sell a ton of glass.
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Old 03-17-2018, 04:13 PM
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blanchards I've seen use stones. Expect it to weight 50 thousand pounds at a minimum. Get a new electric service. Read a lot about them. Not for the faint of heart.
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Old 03-17-2018, 05:38 PM
Steven O'Day Steven O'Day is offline
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Search for 'telescope mirror grinders' lots of amateur machines that look like they would work.
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Old 03-17-2018, 06:20 PM
Chris Lowry Chris Lowry is offline
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I like the telescope idea, kind of like a blanchard but more home made.
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Old 03-17-2018, 07:25 PM
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Quote:
Originally Posted by Chris Lowry View Post
I like the telescope idea, kind of like a blanchard but more home made.
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Well, until you polish with it,
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Old 03-18-2018, 09:41 AM
Eben Horton Eben Horton is offline
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Check this out.

https://instagram.com/p/BgZq7-Zh9o-/
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Old 03-18-2018, 10:45 AM
Chris Lowry Chris Lowry is offline
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That is so cool
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Old 03-18-2018, 10:47 AM
Steve Stadelman Steve Stadelman is offline
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i have an idea or two. 503-709-9922
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Old 03-18-2018, 12:32 PM
Tom Fuhrman Tom Fuhrman is offline
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check out the machines that John Lewis uses to polish, I think they are old Blanchard machines. He's been using them for a long time and has a lot of experience with them.
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Old 03-19-2018, 09:17 AM
Victor Chiarizia Victor Chiarizia is offline
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check out granite city tools. you want granite/marble countertop equipment. peet's a bit low on price though. i'm guessing $200K investment or contract with your local counter top maker to polish. my friend has the most erection inducing cnc machines a guy could want. real cool to watch. v
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Old 03-19-2018, 09:24 AM
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Quote:
Originally Posted by Victor Chiarizia View Post
check out granite city tools. you want granite/marble countertop equipment. peet's a bit low on price though. i'm guessing $200K investment or contract with your local counter top maker to polish. my friend has the most erection inducing cnc machines a guy could want. real cool to watch. v
*******
You're right. As new, that would be low. As used on the other hand, as little as .10 cents on the dollar . In either instance, the shipping and riggers are a killer. If you do it, be really clear on what you are actually buying and it's dimensions and power source. Then you need to know if your electric supplier can provide it in this decade. Last I looked, you were on Maui, not a machine capital of the world. I shudder to think about the logistics.

Smaller machines command higher prices since the electric requirements put a lot more tooling in people's garages . The big stuff more than 5-10HP won't do it. A blanchard, as is true with most tools is critical the bearing construction and condition. Not a tool you want chatter in. I saw a blanchard once that only had a 17 inch swing. I wish I had it. Look in auction sites for machine tools.
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Old 03-19-2018, 09:31 AM
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Quote:
Originally Posted by Eben Horton View Post
I did a version of this with a bridgeport II. It had a table with a 36 inch travel and the ways were really solid, a motorized troike table and the cutter/polisher in the quill. I polished 30 inch pieces of Schott in it but I sold the tool when I moved East. So, it went left to right, round and round and also round in round backwards upside down. Messy... did I mention messy?
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Old 03-19-2018, 07:05 PM
Marc Carmen Marc Carmen is offline
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Pete, I'm in the process of setting up something just like that. Just wondering how well the table dovetails and acme crews hold up with all that glass grit and water that inevitably will get all over the place. Did you have like bellows or dust covers on the moving parts of the table? Was rusting an issue?
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Old 03-19-2018, 07:10 PM
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I did it with ethylene glycol. Really really messy. It all happened in a galvanized tub. Remember, I sold the machine and left town. I probably should have changed my name.
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Old 03-19-2018, 07:18 PM
Marc Carmen Marc Carmen is offline
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Ahhh, very tricky. Ive been using this process on a smaller scale and yes it is messy but it does the job. Maybe one day I'll get a blanchard

Chris, the rotating hand levigator and SiC grit method works well but it's a lot of work
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Old 03-19-2018, 09:10 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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Well Victor he did say if money wasent holding you back- 200 k now were talking
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Old 03-19-2018, 10:12 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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Quote:
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Well Victor he did say if money wasent holding you back- 200 k now were talking
So Chris , I get really curious thinking about this- why are you frazing it like that? Youd really spend anything to grind her work?
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