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7th June 2012, 12:01 PM #16future machinist
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- Mar 2008
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- nowra
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- 1,361
Thanks for the idea I have been using my fingers awell but I have a laser printer I will take the drum out when we get new toner
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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7th June 2012 12:01 PM # ADSGoogle Adsense Advertisement
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- Always
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- Advertising world
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- Many
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7th June 2012, 06:13 PM #17GOLD MEMBER
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- Aug 2011
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- Melbourne
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- 2,951
Great idea. We have a laser printer at work and we recycle the cartridges. Looks like some might not make it!
Simon
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7th June 2012, 09:20 PM #18GOLD MEMBER
- Join Date
- Jul 2010
- Location
- Melbourne
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- 7,775
Sounds interesting, I have a crap roller that seems to do ok, but then I wouldnt know any better lol
Hi Ewan,
I'll p[ut my hand up for one when you get your hands on one. Then I can find out what I'm missing out on Thank you
Stuart
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7th June 2012, 09:24 PM #191915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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8th June 2012, 12:20 AM #20GOLD MEMBER
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- Jul 2010
- Location
- Melbourne
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- 7,775
Thanks Ewan , no hurry I'm sure to be scraping for awhile yet lol besides I might take inspiration from your designs.
Stuart
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16th June 2012, 06:56 AM #21Senior Member
- Join Date
- Jun 2012
- Location
- Germany, Outback of Munich
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- 213
Today, I got the idea to somehow guestimate the thickness of a layer of blue made with that brayer.
Granite plate was used. Means blue spread and "wiped off" through severals spottings and refreshes (without picking up new colour). So to say clean but saturated with blue.
Then I weighted the brayer in the clean state, picked up blue, and re-weighted it. It picked up 0.1 grams (well, resolution of my scale is 0.1 g; so some uncertainty).
Specific weight of the blue is a bit above 1 g / cm^3 (just sinks in water).
Then I spread the blue on the roller on my spotting area that is 90 by 15 cm.
So, the resulting thickness is 0.7 µm.
If I wipe over the granite with my finger, I almost don't pick up colour.
But this is extreme spotting! You won't get some readings if you haven't spent quite a few hours with the work trying to get it flat.
As a wild guess, I normally do have a layer of blue that is 5 times thicker.
Nick
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16th June 2012, 02:53 PM #22GOLD MEMBER
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- Jul 2010
- Location
- Melbourne
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- 7,775
Hi Nick,
I have a few problems with what you have done. Did you reweigh the roller after to see if all the blue was on the spotting area?
Also I think it assumes that your spotting area is not only flat(which it should be) but very smooth(which as you have said yourself granite isn't). So while you should be able to say that the blue is "no thicker" than 0.7 µm, it could be much thinner couldn't it? Though how much thinner when you say the pigment is ground to .001mm? I would expect most of the pigment would be much smaller than that but couldn't put a number on it.
Having said all that, as yet I haven't got any better ideas, Good work.
Stuart
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16th June 2012, 06:26 PM #23Senior Member
- Join Date
- Jun 2012
- Location
- Germany, Outback of Munich
- Posts
- 213
Yes, I weighted before picking up blue, after picking up blue and after spreading blue.
As I said, the granite was not cleaned, but it already had blue in all the small pores. I've been using it for 4 days without cleaning it. Means, without using a solvent, just wiping it off.
I used Dykem, so I have no information how big their pigments are.
The number I got from Kremer was the average size of the pigments. Maybe they could be milled smaller upon request.
With the corse resolution of the scale, there's an uncertainty of about factor two. So it might also be 1.4 µm or 0.35 µm.
I'm quite at the sweet spot of the layer, because refreshing without picking up blue works only once, then the spotting on the work gets way too thin to make sense. So, refreshing with picking up blue, spotting, refreshing without new blue, spotting, GOTO 1. Rethinking this sequence, it would mean that the layer is half as thick as calculated.
Anyhow, it's just a ballpark of how thin the layer can be made.
Nick
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