Thread: Melbourne Scraping Class Reflections

if anyone else is interested in a granite plate kindly contact me in the next few days.

Greg

Originally Posted by Greg Q

if anyone else is interested in a granite plate kindly contact me in the next few days.

Greg

I'd be interested Greg depending on size.
Cheers,

Ross

Hi all,
I got the chance to inspect the metrology department at our local University yesterday. Apparrantly at work we are affilliated with them and are allowed to use their facilities. In the Metrology room were two Granite tables, one was six foot by four foot and the other four foot by three foot. The larger one had a wooden cover on it that was in bad need of repair while the smaller one is the one used by the trade apprentices as a desk while doing their exams. I asked the trade teacher if they had any camel backs which then required an explanation as to what one was. Looking around the room I found one, it was sitting near the rusty cylindrical squares, oops, sorry, paperweights for the exam papers. I asked him if he was ok with me using some of the facilities and he replied, "so long as I bring him a couple of beers it should be ok"
Lucky me. Still at least I now have some gear at my disposal.

Scrape on gentlemen.

Phil

How about just giving him a few more beers to permanently liberate them from the clutches of heathens? (The portable things I mean)

Greg

RC for big files one can use
YouSendIt: Online File Sharing and collaboration with FTP Replacement - Send Large Files and Email Attachments with Managed File Transfer Solution

as an alternative to burning to DVD and postage.

I use the free version, but you can sign up if one wants

Originally Posted by Rossi

I'd be interested Greg depending on size.
Cheers,

Ross

email sent Rossi. You're on the list.

Greg

Originally Posted by Greg Q

if anyone else is interested in a granite plate kindly contact me in the next few days.

Greg

Please note that the order is being finalised today.

Greg

I have a reasonable amount of round Durabar in 75mm & 100mm diameters. Lovely to machine. I've got to wondering now if this would make good base stock for cylindrical squares.

Likely need it ground on a cylindrical grinder to finish. Worth a bit of thought...

Originally Posted by Greg Q

Please note that the order is being finalised today.

Greg

PM sent............ you're a bad influence Greg

Originally Posted by PDW

I have a reasonable amount of round Durabar in 75mm & 100mm diameters. Lovely to machine. I've got to wondering now if this would make good base stock for cylindrical squares.

It would be fine, hardened and ground is nice, but there’s plenty of stable cast iron used in metrology, angle plates for instance. You just have to handle them like they are soft. As you should with all instruments.

I wouldn’t exceed about 3:1 height to diameter ratio. So 225h for the 75mm and 300h for the 100mm.

And here’s the trick, don’t just put a centre in each end, like all the ones you can buy. Drill and tap the centre M5 or M6, then single point bore the centre’s, it doesn’t matter if the centre ends up being 7 or 8 mm diameter. A grinder dead centre will still run on that.

It makes it a much more versatile tool. You can use that tapped centre hole to mount it to things. Just like a toolmakers button.

And don’t forget to drill and tap another hole, out near the land on the end, so you can screw in a pin and use that as a drive dog.

Regards Phil.

Originally Posted by Machtool

It would be fine, hardened and ground is nice, but there’s plenty of stable cast iron used in metrology, angle plates for instance. You just have to handle them like they are soft. As you should with all instruments.

I wouldn’t exceed about 3:1 height to diameter ratio. So 225h for the 75mm and 300h for the 100mm.

And here’s the trick, don’t just put a centre in each end, like all the ones you can buy. Drill and tap the centre M5 or M6, then single point bore the centre’s, it doesn’t matter if the centre ends up being 7 or 8 mm diameter. A grinder dead centre will still run on that.

It makes it a much more versatile tool. You can use that tapped centre hole to mount it to things. Just like a toolmakers button.

And don’t forget to drill and tap another hole, out near the land on the end, so you can screw in a pin and use that as a drive dog.

Regards Phil.

Thanks for that, good information. Particularly the offset tapped hole for a driver, I was thinking I'd have to make up a big drive dog for the thing.

I tend to baby my metrology gear so soft isn't a big deal.

If I make 2 I can check if the grinder got them right or not...

PDW

Originally Posted by Greg Q

How about just giving him a few more beers to permanently liberate them from the clutches of heathens? (The portable things I mean)

Greg

Funny thing happened today Greg, we got a phone call from the Metrology department at the uni. It seems that after we left they decided that maybe two granite tables are one too many so they have decided to donate one of them to us for our use. They are now deciding on which one. Fingers crossed for the larger one and they keep the smaller table/desk for their own use. They dont do metrology anymore but might in the future.
Here's hoping

Phil

Whoa, that's brilliant! and very generous of them.
Joe

Could not have belted the smile off my or my bosses face all day Joe

Phil