Re: [CAD_CAM_EDM_DRO] Re: Milling Glass

Hydrofluoric acid is the most evily, dangerous acid you can buy. At high
concentrations it will burn it's way through glass quickly. You must keep it
in containers specific to HF. If you spill the acid on yourself it is very
capable of passing through your skin and into your bones. If it does it can
quite rapidly decalicify your bones. And then where would you be? I was
looking at buying some a while back and the precautions you should take
include heavy chemical resistant gloves, a visor for your face, some sort of
lab coat to cover your front (But we all have one already right?) and a dust
mask / respirator incase the acid should be aerosolerised (I don't know if
that's a real word but it sounds good and that's all that matters). I was
checking how much 98% something acid would be and for 25ml it was about £15.
Obviously if your using concentrations that are near 1%HF the gloves are
about the only thing you need. I think it's anything above 45% and you need
to use specific HF handling plastics. Buy it pre-diluted and then you don't
have to worry. If you buy it raw remember it's acid to water, not water to
acid. I think one of the other bits you need for handling it is some sort of
alakli to neutralise it should you spill it on yourself. Diluted caustic
soda or bleach would work I suppose. If you spill it on the floor in great
amounts you should try to mop it up then neutralise the remains because it
effffferveses when you neutralise it quickly (I think) and could form an
aerosol cloud of the acid. In low concentrations it is more dangerous in a
way because you can spill the acid on your skin and not realise it's being
absorbed for a good few minutes (Or even hours according to safety cards).
Among other things you can make chemical weapons with it... so don't go
ordering too much or they'll be a knocking on your door.

Ever worried that he is being secretly indoctrinated by aliens in league
with the government living in his duvet,
John

----- Original Message -----
From: "dave engvall" <dengvall@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 13, 2001 2:37 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Milling Glass


> diazden wrote:
>
> > John;
> >
> > I have seen beautifully etched glass panels and they were done with
acid (cant remember
> > which one) the only problem is that glass etched that way is very easy
to stain
> > regards
> > Mariano
>
> Glass etches with HF (hydrofluoric acid) ;it is a weak acid but causes
exceeding nasty burns which tend to follow nerve tissue and
> can take months to heal. The etching is fine grained and not very deep.
> That is why most people use the NaF/sulfuric acid paste. Used to be
considered safe for Girl Scouts to use in craft projects. In
> todays world I make no claims. Too many attorneys and not enough sand.
>
>
>
> Dave
>
> >
> >
> > "
> >
> > >
> > > kleinbauer@... wrote:
> > >
> > > > Hi Andrew,
> > > > I was hoping to find away to etch glass at a hobby
> > > > level. My friends own a glass company. They do custom store
> > > > fronts. Right now they have an artist who comes in and does
> > > > letter heads etched on the glass windows. The artist suits
> > > > up in a booth, he uses glass beads shot out of a sand blaster.
> > > > He uses masking tape and a razor to lay out the designs.
> > > > Someday I hope to build a device simular to a ink jet printer.
> > > > Instead of ink It will be shooting glass beads. Righ now I am
> > > > still at work redrawing my circuit board. I want my homemade
> > > > milling machine to etch the board and put in starter holes.
> > > > The first set of boards worked great, except for manual hole
> > > > layout and drilling process. I want to be able to supply
> > > > circuit boards for my kits. I am predrilling the hole
> > > > locations with the mechanical etching bits.
> > > >
> > > > John
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> >
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
> >
> > Addresses:
> > Post message: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> > Moderator: jmelson@... timg@... [Moderator]
> > URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> > bill,
> > List Manager
> >
> > FAQ: http://www.ktmarketing.com/faq.html
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>