Re: Internal Threading - Compound Setup
¿ªÔÆÌåÓýYou buy or make a plug gauge with as nearly exactly the thread you need to mate to as you can manage. For a lathe chuck, a duplicate of the spindle.? For the one I made for my Atlas I was essentially copying one of my class projects, but 8 tpi instead of the 12 tpi they wanted. So I wound up cutting something like 3/4" of finished threads off because the Atlas spindle doesn't have an inch and a half long threaded nose. Until I made the 2-1/4x8tpi stub for my Heavy 10L it was the most perfect thing I've ever made on a machine tool. Personal best, not necessarily something a real machinist would be impressed by. My instructor said it was the best I'd done. Took several hours, as I was checking both of them frequently. Not something a job shop would approve of.? Bill in OKC Sent from my Sprint Phone. -------- Original message -------- From: Ronald Mattson <mattsonrj@...> Date: 1/9/19 9:39 AM (GMT-06:00) Subject: Re: [atlas-craftsman IO] Internal Threading - Compound Setup I rarely comment, but this one has me mystified. How do you use thread wires on internal threads? Even if the wires are bent into a circle to fit inside the internal thread, you need an internal micrometer or a caliper with a blade anvils to measure the wires on a tangent. On regular calipers or micrometers, each anvil will be measuring on their two edges, so the measurement will be inaccurate on the small side. Please enlighten me. Regards, Ron Mattson
On Wednesday, January 9, 2019, 10:23:55 AM EST, Jody <jp4lsu@...> wrote:
Thanks Bill,? I think I'm going the thread wire route.? Doing a little research and digging it seems to be the method for accuracy, it's economical and versatile. As far as mic's, I have all I need there. 0-6" mitutoyo 6-9" Starrett (single micrometer with 2 anvil inserts) So I'll be getting some thread wire. -Jody -------- Original message -------- From: "Bill in OKC too via Groups.Io" <wmrmeyers@...> Date: 1/9/19 8:00 AM (GMT-06:00) To: [email protected] Subject: Re: [atlas-craftsman IO] Internal Threading - Compound Setup Thread wires and regular micrometers. Mitutoyo or Starrett if you like, but regular mikes. ;) They are way more versatile, and relatively speaking, cheaper, too.? http://www.starrett.com/metrology/product-detail/585BP $371, and only does 7,8, & 9 tpi. How often are you going to be measuring those threads? http://www.starrett.com/metrology/metrology-products/precision-measuring-tools/micrometers/outside-micrometers#currentPage=1&displayMode=grid&itemsPerPage=24&sortBy=wp/asc 1", 2", & 3" Starrett outside mikes for about $400 for all three. Another $40 or $50 for one of the more expensive threadwire sets, and you can measure any thread up to 3" diameter. Sounds like a simple decision to me for anyone who doesn't absolutely need a thread mike like that several times a day, every day. IMNSHO, anyway. :) Bill in OKC? Sent from my Sprint Phone. -------- Original message -------- From: Jody <jp4lsu@...> Date: 1/9/19 6:57 AM (GMT-06:00) Subject: Re: [atlas-craftsman IO] Internal Threading - Compound Setup You guys are going to make me go out and by more tools aren't you? I looked at some thread micrometers last night.....Shars were pretty cheap....then I found some Mitutoyos.....YIKES!!! Would you guys suggest a Shars thread mics or thread wires? I would need a lesson on using thread wires. -Jody |
Bill in OKC too