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- From: forbesm@atlantis.CS.ORST.EDU (Mark Forbes)
- Newsgroups: comp.sys.hp48
- Subject: Re: Engraving an HP48
- Message-ID: <1hdiu9INNj0f@leela.CS.ORST.EDU>
- Date: 25 Dec 92 00:00:08 GMT
- References: <Bzs1r8.I48@cs.dal.ca>
- Organization: OSU CS Outreach Services, Corvallis, Oregon
- Lines: 41
- NNTP-Posting-Host: atlantis.cs.orst.edu
-
- sweet@ug.cs.dal.ca (garth r sweet) writes:
-
-
- > I recently tried to get my name and SIN number engraved on my HP48
- >figuring to make it at least slightly more secure, but when I tried the
- >key houses and engraving shops kept turning me away, saving that most
- >plastics will melt when they try to engrave it, hence they won't even try.
- >Has anyone else had this problem? How do you mark your calculators, or do
- >you, I figure most people are like me in that after they shell hundreds
- >of dollars for these supper calcs, they like to put thier name on them.
- >Maybe I just have to find the right shop.
-
- Heat works best. The case is made of a nylon/ABS blend that will melt quite
- nicely. A soldering iron, carefully wielded by an artiste (as opposed to
- any old fumble-fingered engineer like me...) can do a credible job of
- engraving whatever you want. If you want to get really tricky, find someone
- who has a Metcal soldering iron and use the unbelievably-tiny-size tip.
-
- Your local tattoo artist may have some suggestions. If you're just into
- a workmanlike job, you can do it yourself with an iron, or get a set of
- lettering punches and heat them up to about 350 degrees. That'll work
- just fine. Don't overheat the punches or they'll lose their temper and
- turn to mushrooms the next time you whack a piece of cast iron.
-
- I'd recommend *strongly* against using a vibratory engraver. The level
- of vibration is such that I would be concerned about damaging the
- display or electronics. Yes, I *know* it's an HP, but that display is
- still made of glass.
-
- The rotary engravers will in fact turn the plastic into putty if run at
- a high speed. If you can get an engraver to turn the speed way down
- then it should work fine. The idea is to cut at such a slow speed that
- you don't build up lots of frictional heat. The ABS starts to soften
- at about 250 F, I think, so you need to be careful.
-
- Good Luck!
-
- Mark G. Forbes | forbesm@atlantis.cs.orst.edu
- Corvallis, OR | 503 757 8416 work phone | Hardware R & D
- Sparcom Corporation
- forbesm@sparcom.com
-