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On the Inside
Well-Known Member
This is actually the original performed by the writer and his rockabilly band
Trust Yourself
_ Bob Dylan
_ Bob Dylan
On the Inside
Well-Known Member
Router on wood with dust collector backup.
• thanks NitroTrust Yourself (Remastered)
John and Martina McBride used to fund a project I worked on for the music recording industry when I was designing and manufacturing parts for Korby Audio Technology studio grade recording microphones.
There was one particular part I made for the mics that required a 7/8-100 thread per inch internal thread to a shoulder that was about 1MM (.040) deep and a matching external thread on the mating part that were both made of brass. The peak to peak size of the thread was about .004 inch,or about .001 inch larger than an average human hair.
The blind shouldered thread was about .75 MM deep with a .25 MM tool clearance groove that had a serious crash potential for a very tiny delicate internal thread cutting tool if it hit the back wall. The tool was ground on a surface grinding machine that was about .5 MM(.020 in.) wide in order for it to have clearance to the relief before the shoulder with a full thread before the blind area crash zone and had to be hand finished on a whetstone to make it smooth enough to cut cleanly in miserable to cut brass. I ran 20 multiple pass cuts that took about thirty seconds for the entire process to complete that was moving and stopping faster than you could see. Every time I hit the start program button,I had to hold my breath because of the crash potential and ruining a tool that took five hours to make. I never broke the tool.
The thread was .005 inch deep and required inspection under a microscope because it resembled a scratch to the naked eye. At first,my shop produced hundreds of both parts at a time and select fitted parts to find suitable fits for adjustments done in a sound lab.After tweaking my CNC machine and using a $500 commercial grade thread go/no go standard,I has able to produce runs of 100 mating parts that were interchangeable. With a .007 theoretical thread depth that can never be achieved in full and the .00025 inch tolerance for the actual thread clearance,they were really something to be proud and the awe of many seasoned machinists. Korby burned me for some product,so I shut his tap off and he sent the work to China where the quality suffered a lot,but they were willing to play for cash up front
Leave it to autie focus to some serious detail,otherwise stay on the porch with the pups
This is me holding an unfinished KAT HRS body I designed and machined that took about two hours of CNC machine time to produce both parts.
The lower pic is from the Korby website of a finished mic
The next pic is of a recent dealer sale price for one
http://www.korbyaudio.com/ client list
Sorry for the rant,or am I?
Last edited:
Littlefinger
Active Member
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