Path: ...!feed.opticnetworks.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Bob La Londe Newsgroups: rec.crafts.metalworking Subject: Re: Gauge blocks Date: Thu, 27 Jun 2024 17:44:41 -0700 Organization: A noiseless patient Spider Lines: 59 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 28 Jun 2024 02:44:42 +0200 (CEST) Injection-Info: dont-email.me; posting-host="2547660374235422506f7a322257dc5b"; logging-data="3124652"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX191wVsATEcdPS1/XD8aGam7" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:8AQFne9YMHqG0AGa9ovCXcuPUH4= In-Reply-To: X-Antivirus-Status: Clean Content-Language: en-US X-Antivirus: AVG (VPS 240627-6, 6/27/2024), Outbound message Bytes: 3552 On 6/27/2024 4:56 PM, Snag wrote: > On 6/27/2024 4:56 PM, Bob La Londe wrote: >> On 6/27/2024 12:35 PM, Snag wrote: >>>    Am I really going to need to allow for millionths of an inch ? I'm >>> looking at an 81 piece set from Shars , a grade B with the deviation >>> table for under a hundred bucks . Looks like the biggest variance is >>> .000034" , or about a third of a ten thousandth . I can't see any >>> project that I might get needing that kind of precision ... >>>    I'm considering buying the set just because I've kinda wanted some >>> and I think they'll get me closer to perfect in my upcoming depth >>> mike project . Since they can trace back to a national standard I can >>> also use them to check all my other micrometers , none of which have >>> been calibrated for at least 40 years , and in some cases longer than >>> that . >>> >> >> You will probably be fine.  I hardly even use my gage blocks.  I just >> CNC machine an angle plate with a stop.  I have a cheap B grade set, >> and I miced them (I have Starret standards), and they are as good as I >> can measure except the 4 inch which for some reason is almost exactly >> 4.001 >> >> I have a set of gage pins too.  Most of the time I just use my set of >> drill blanks because its faster and most holes I'm checking are >> nominal standard sizes anyway.  If they aren't I measure them with an >> inside mic. >> >> >> >> >> > > I'll probably only use them for calibration checks . And only because > one of these days something I make is going to have to be a pretty > precise fit for something somebody else makes . Gauge pins are on my > wish list too . I got a set of thread wires a while back . Haven't used > them yet but then I haven't needed a precise thread fit . I have a > couple of projects in mind that will require a fairly precise thread ... >   OBTW , I did order that set of Shars blocks . Under 110 bucks , and > there's no doubt that if I waited I'd be paying more . Yes. Everything always goes up and lately very quickly. I've been bringing in some cash the last couple months, so I have been buying things I need and stocking up on materials so I'll have it when things inevitably crash again. -- Bob La Londe CNC Molds N Stuff -- This email has been checked for viruses by AVG antivirus software. www.avg.com