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Joined: Tue Jun 24, 2014 4:13 pm
Posts: 243

Post Posted: Mon Dec 18, 2017 7:02 pm 
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Blue68F100 wrote:
Looks like you setup your shelf.

The 1.5 x8tpi is not hard provided you have a good heavy insert holder for internal threads. I've done several 1" x 20 (& 40) tpi blind holes which I hate doing since there is no room for run out (0.050"). What I have come to hate is cutting metric threads. It's a royal pita, since you can not disengage the threading system till your finish. Just go slow and don't rush it you will be fine.
Thank you for the reply. Yes that shelf is amazing. Thank you for thinking outside the box on that one.
I'm going to look for a more rigid internal tread tool. The ones I have I don't think will give me the DOC I need. From what I measured the thread depth is .127. Yikes.
I've also noticed that the term boring bar did not get it's name from boring a hole. It's from standing in front of the machine only peeling .030 per pass. I have a mile to go.

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Joined: Fri Nov 30, 2012 9:40 pm
Posts: 224

Post Posted: Tue Dec 19, 2017 2:18 pm 
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There are 2 type of threading insert tools that I have seen. Some have the insert laying down (horz), the other mounted on end/side Vertically. Brownells sells a boring bar setup that uses the Vertical mounting inside and outside threading. Here is a link to the bar I use when the bore is large enough to use. https://www.brownells.com/gunsmith-tools-supplies/power-tools-accessories/high-speed-steel-cutters/1-2-threader-kit-sku080000839-45233-80060.aspx?sku=080000839 Uses HS T15 inserts which are fairly cheap too. Would have to make sure the insert is capable of cutting that pitch, but I think it is. My smaller cutters are very limited.

When you get to those big heavy threads, you want to use insert holder as large as you can possibly use for rigidity. And the shortest length extended. I have some small solid carbide thread boring bars that are tiny but have 1.5" reach, small bore of .375". I end up taking very light cuts (0.0005") when I get near to my final dimension.

Good luck.

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David

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Post Posted: Tue Dec 26, 2017 6:39 pm 
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Dang! I like that link for that bar. Looks extremely handy. May have to grab it. I'm starting to collect all kinds of stuff. Just never what I need. Lol

Made some headway on the fixture. Threads are done and the platter was flipped to face and true OD. Next step is the mill work. ImageImageImageImageImageImageImage

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Post Posted: Tue Dec 26, 2017 8:10 pm 
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Looks like it came out good. Yes on never having the right tool to make it easy. Your boring bar looks like its heavy enough not to flex. I try to use inserts when it comes to threading, just encase one gets chipped or broken. With the indexed bars it's as simple as rotating the insert. No tying to get it back in alignment, just rotate and go. The only problem I run into is the inside diameter needs to be .75" or larger.

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David

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Joined: Wed Aug 05, 2015 3:34 am
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Post Posted: Wed Dec 27, 2017 2:52 am 
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Dustin,
Excited to watch this fixture shape up! Great work!

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Post Posted: Sun Dec 31, 2017 9:51 pm 
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What a mess!

Cleaned up nice. Next up is the center shaft. Hopefully knock it out in the morning. After that I'm putting this on the second shelf with a rag over it as I could go without seeing this for a week or so. Hell of a project. ImageImageImageImageImageImageImage

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Joined: Sat Feb 26, 2011 2:48 am
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Location: Northern Virginia

Post Posted: Mon Jan 01, 2018 2:25 pm 
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Was there a workpiece under the swarf?? :D The setup and cleanup are the thankless parts of the jobs. Jerry is smiling on your progress!
Joe

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Post Posted: Mon Jan 01, 2018 4:14 pm 
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Nicely done. Now you just need to test to see how it works, so you can plan upgrades if needed.

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David

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Joined: Thu Nov 17, 2016 5:41 am
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Location: Eastern NC

Post Posted: Mon Jan 01, 2018 5:48 pm 
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Go Dustin Go!

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Joined: Tue Jun 24, 2014 4:13 pm
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Post Posted: Mon Jan 01, 2018 9:39 pm 
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Jolly Rogers wrote:
Was there a workpiece under the swarf?? :D The setup and cleanup are the thankless parts of the jobs. Jerry is smiling on your progress!
Joe
Hahaha! Man o man. The lathe AND mill were disasters. Lol.

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