Lonewolf McQuade Posted July 17, 2021 Author Report Share Posted July 17, 2021 😂🤣🌩 Quote Link to comment Share on other sites More sharing options...
Lane Posted July 17, 2021 Report Share Posted July 17, 2021 Printed out a few measured scales to test the scope cameras against. Turns out I still needed to do some other pencil marking, testing; and then math. But even with the initial angular testing; I was able to estimate the same numbers calculated in the end. The Depstech focal distance appears to be almost exactly 6mm - 7mm or 0.25", and slightly beyond. The Field of View appears to be 45 degrees. The Teslong focal distance is wider, giving a focus between distances of 10mm through 13mm; 0.4" - 0.51". It also has a wider FOV angle; of around 75 degrees (maybe 82 degrees?). Should be able to attach a simple printed measuring scale to the end of the scope if one wanted those capabilities inside a bore. Might just attach it to a piece of thin stiff wire. Quote Link to comment Share on other sites More sharing options...
DustBuster Posted July 17, 2021 Report Share Posted July 17, 2021 That is a cool experiment there Lane. Somehow your idea entails holding some kind of printed scale out at the focal distance... First Focal plane BoreScope. I might try a second focal plane transparency that sticks to the mirror. The transparency thickness could screw up clarity. Otherwise, I guess you’d have to share the object zone with the measuring scale, held out by a wire? That is a simple idea though to spin off of, I have some cap/resistor or diode leads that I could measure. Maybe there in the ball park of head space thickness .003 I think. Bet the smallest wire is actually more than that. Could suspend a strand of course Golden Retriever or Gopher hair across the focal plane. Either way, cool idea, getting your printer to print so small to investigate is good practice. After you get paid huge dollars by the Med industry, make sure you deposit .003% into BeltFeds and my account. Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 17, 2021 Author Report Share Posted July 17, 2021 6 hours ago, Lane said: Printed out a few measured scales to test the scope cameras against. Turns out I still needed to do some other pencil marking, testing; and then math. But even with the initial angular testing; I was able to estimate the same numbers calculated in the end. The Depstech focal distance appears to be almost exactly 6mm - 7mm or 0.25", and slightly beyond. The Field of View appears to be 45 degrees. The Teslong focal distance is wider, giving a focus between distances of 10mm through 13mm; 0.4" - 0.51". It also has a wider FOV angle; of around 75 degrees (maybe 82 degrees?). Should be able to attach a simple printed measuring scale to the end of the scope if one wanted those capabilities inside a bore. Might just attach it to a piece of thin stiff wire. You are definitely smarter than me! Interesting experiments 👍 Quote Link to comment Share on other sites More sharing options...
DustBuster Posted July 17, 2021 Report Share Posted July 17, 2021 (edited) Ok Lane here are two pictures of my comparisons between a good headspaced bolt closed on a case and my Sharps bolt closed on the same case. I took movies and tried to snapshot at the same spot on the rim... couple little nicks on case neck... I’m a little off on rotation but close. If one picture measured ..003 “ closer, I’d be in trouble. For Reference this brass is 2.004” Edited July 17, 2021 by DustBuster Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 Ya'll have certainly went over my head. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 17, 2021 Report Share Posted July 17, 2021 22 minutes ago, Belt Fed said: Ya'll have certainly went over my head. Sometimes I have to stop reading @Lane 's posts in the middle cause my brain overheats trying to keep up. Always worth digesting them for those golden nuggets though Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 Diamondback 223 Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 old Armalite AR 180 bore and edge of the extractor. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 17, 2021 Author Report Share Posted July 17, 2021 Takes pretty damn good pics for what they cost! Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 17, 2021 Author Report Share Posted July 17, 2021 Just now, Belt Fed said: That's crude up! That your a$$ or the inside of a rifle? Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 Diamondback 300 blackout. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 1 minute ago, Lonewolf McQuade said: That your a$$ or the inside of a rifle? yes Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 17, 2021 Report Share Posted July 17, 2021 19 minutes ago, Lonewolf McQuade said: That's crude up! That your a$$ or the inside of a rifle? You know that is really workin on my OCD. no doubt that rifle will get a cleaning tomorrow. Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 17, 2021 Author Report Share Posted July 17, 2021 😂😃🤣 Quote Link to comment Share on other sites More sharing options...
unforgiven Posted July 18, 2021 Report Share Posted July 18, 2021 Hahaha Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted July 18, 2021 Report Share Posted July 18, 2021 3 hours ago, Belt Fed said: You know that is really workin on my OCD. no doubt that rifle will get a cleaning tomorrow. I need to show you pictures of some of mine then. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 18, 2021 Report Share Posted July 18, 2021 (edited) Brand new Wilson Combat 260 Rem, it wasn't $200 on sale. 2021-07-17-19-3200975.bmp2021-07-17-19-3052061.bmp2021-07-17-19-3052061.bmp 2021-07-17-19-3434670.bmp 2021-07-17-19-2949470.bmp Brand new BSF 6.5 Grendel barrel at over $600 msrp. 2021-07-16-19-3147986.bmp 2021-07-16-19-3337634.bmp 2021-07-16-19-3428577.bmp I think the WC has had a bit of hand lapping as well as just a smoother all around look. Edited July 18, 2021 by jtallen83 Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 18, 2021 Author Report Share Posted July 18, 2021 1 minute ago, jtallen83 said: Brand new Wilson Combat 260 Rem, it wasn't $200 on sale. 2021-07-17-19-3200975.bmp 3.52 MB · 0 downloads 2021-07-17-19-3052061.bmp 3.52 MB · 0 downloads 2021-07-17-19-3052061.bmp 3.52 MB · 0 downloads 2021-07-17-19-3434670.bmp 3.52 MB · 0 downloads 2021-07-17-19-2949470.bmp 3.52 MB · 0 downloads B rand new BSF 6.5 Grendel barrel at over $600 msrp. 2021-07-16-19-3147986.bmp 3.52 MB · 0 downloads 2021-07-16-19-3337634.bmp 3.52 MB · 0 downloads 2021-07-16-19-3428577.bmp 3.52 MB · 0 downloads 2021-07-16-19-3158258.bmp 3.52 MB · 0 downloads I think the WC has had a bit of hand lapping as well as just a smoother all around look. Tree rats build a nest in there? 🤣 Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 18, 2021 Report Share Posted July 18, 2021 3 minutes ago, Lonewolf McQuade said: Tree rats build a nest in there? A good thing, fibers left from the lapping process, gonna be a much easier break in cleaning for the Wilson. For over $600 you would think BSF could smooth up those edges a bit. Quote Link to comment Share on other sites More sharing options...
Lonewolf McQuade Posted July 18, 2021 Author Report Share Posted July 18, 2021 12 minutes ago, jtallen83 said: A good thing, fibers left from the lapping process, gonna be a much easier break in cleaning for the Wilson. For over $600 you would think BSF could smooth up those edges a bit. Thats going to be a hell of a barrel I bet! Quote Link to comment Share on other sites More sharing options...
Lane Posted July 18, 2021 Report Share Posted July 18, 2021 17 hours ago, DustBuster said: Ok Lane here are two pictures of my comparisons between a good headspaced bolt closed on a case and my Sharps bolt closed on the same case. I took movies and tried to snapshot at the same spot on the rim... couple little nicks on case neck... I’m a little off on rotation but close. If one picture measured ..003 “ closer, I’d be in trouble. For Reference this brass is 2.004” I don't think you can see a difference in headspace from that vantage point. I was planning to measure the max neck length I could cram in some 300 Blackout builds though; and that would be done with pictures like those you took (and ideally a measuring scale). Someone else is welcome to chime in on this. But headspace is measured between the bolt face and the datum line on the shoulder of the cartridge. Even if you ended up with a bolt that doesn't close on the cartridge; the borescope view should be the same, as the cartridge is jammed up against the shoulder inside the chamber already... So that distance from the tip of the neck to the ridge in the chamber is an allowance for longer case neck. Since they stretch over time. I'm guessing based on that picture that you could probably go a hair over max length (assuming what's inside is trimmed to min length already). Even with a headspace gauge in the chamber; I don't think you can see anything of interest with the borescope. This is a pretty garbage picture of a measuring scale attached to the scope mirror. Each dot is 10 mil on center, and the rows are offset by 5 mil. Unfortunately I had to turn down the scope illumination quite a bit to see the dots though. Since it's made on a laser, I can make the dots darker, or punch all the way through; or maybe just use a different material. Kapton tape might work if it's not too reflective. I could try the laser printer again, but I wasn't fully sold on the quality of tiny printing when running yesterdays tests. I'll post back when I have a more functional setup. Quote Link to comment Share on other sites More sharing options...
Belt Fed Posted July 18, 2021 Report Share Posted July 18, 2021 Amazon says the borescopes will be here today. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 18, 2021 Report Share Posted July 18, 2021 1 hour ago, Belt Fed said: Amazon says the borescopes will be here today. So for $16.04 I have another on the way, tempted to grab a couple more for gifts at that price! Quote Link to comment Share on other sites More sharing options...
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