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forrest
Post subject:   PostPosted: Jul 27, 2017 - 08:37 AM
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Joined: May 10, 2010
Posts: 1443
Location: Ganymede
Granite is nice. I cleaned up around a surface plate yesterday. It can be made all kinds of flat, and it is heavy and stable. Duh.

Is that Excellon drill running paper or magnetic tape? There's a Hardinge NC lathe in the hangar that was converted to LinuxCNC, but the old racks were never thrown away. I think that there are still some scraps of ticker tape floating around somewhere. It's punched out like Morse code.

I reverse engineered enough of my CNC router this evening to get the X-axis steppers to move. I need to figure out how I am going to fixture the PCBs. Build just a vacuum bed? Or purchase aluminum or phenolic linen entry and exit boards? I might be overthinking this since my spindle can only do 30k RPM.

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webgeek
Post subject:   PostPosted: Jul 27, 2017 - 05:19 PM
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Joined: Feb 02, 2005
Posts: 8914
Location: Powder Springs
Forrest,
The Excellon spindle heads had an integrated pressure foot, iirc. With a vaccuum attached too, iirc.
As you pointed out earlier, without something like the pressure foot, the carbide tooling will 'pop' whatever you are trying to drill.
Excellon also carefully controlled drill head feed rate as many materials are sensitive to how they are drilled. This was most important with multi-layer boards as it effected the etch-back process prior to thru-hole plating.
HTH

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mattmatt2749
Post subject:   PostPosted: Jul 29, 2017 - 09:49 PM
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Joined: Jul 24, 2015
Posts: 85
Location: Dallas, GA
I realigned the flux capacitor core to dampen the vibration caused by the dilithium crystal fusion chamber and now it runs within .2 MHz. Its perfect now. Very Happy
 
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forrest
Post subject:   PostPosted: Jul 30, 2017 - 03:24 AM
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Joined: May 10, 2010
Posts: 1443
Location: Ganymede
I used a 3.3mF oil filled flux capacitor last night set at 175VDC to spot weld some thermocouple wire together. True story. Chris has the pictures.

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webgeek
Post subject:   PostPosted: Jul 30, 2017 - 09:26 PM
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Location: Powder Springs
forrest wrote:
I used a 3.3mF oil filled flux capacitor last night set at 175VDC to spot weld some thermocouple wire together. True story. Chris has the pictures.

What pictures?
He makes this stuff up.

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webgeek
Post subject:   PostPosted: Jul 31, 2017 - 01:29 AM
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Actually, he did send me the pix, but I deleted them during house cleaning.

4east --
Here's a nice DIY spotwelder.
Surprising how good it works.
https://www.youtube.com/watch?v=McKbU9Bu_30

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artv8880
Post subject:   PostPosted: Aug 01, 2017 - 06:23 PM
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Joined: Dec 05, 2005
Posts: 3

Alabama Damascus Steel is adjacent to the Chief Ladiga Trail just south of the Jacksonville welcome center and about 50 yards east on Francis St. Pretty interesting place.
http://www.alabamadamascussteel.com/
 
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webgeek
Post subject:   PostPosted: Aug 02, 2017 - 02:32 AM
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artv8880 wrote:
Alabama Damascus Steel is adjacent to the Chief Ladiga Trail just south of the Jacksonville welcome center and about 50 yards east on Francis St. Pretty interesting place.
http://www.alabamadamascussteel.com/

It would be interesting to visit. See how they forge their billetts.
Their prices seemed reasonable to me.
Wonder if they have someone local to do the handles?

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