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Author Topic: Borescope  (Read 663 times)

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Offline and7barton

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Borescope
« on: September 18, 2008, 10:46:19 AM »
Hi - Does anyone have any plans or diagrams for building your own borescope for use with CANNON-sized calibres ?
Thanks.
Richard
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Founder in 1986 of Historical Artillery Corps, later changed to Historical Artillery UK.
Builder of Cannons and models for South-Western Artillery, Fort Amhurst, Coalhouse Fort and private commissions.
Technical Consultant for two episodes of Scrapheap Challenge. Ex Pyrotechnic Safety Officer at Coalhouse Fort. I go trekking and survivalist camping - build experimental tents and survival equipment - caving.

Offline Articifer Tom

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Re: Borescope
« Reply #1 on: September 18, 2008, 03:16:33 PM »
 Yeah , made one years ago . went to flea market got front lens in its adjustable sleeve from old slide projector ,for magification. Then eye piece from telescope. When purchasing you can simply test by moving to and aft to see if you can focus on something as deep as your barrel, then at end used right angle prism from old bioculars .
  Mounted every thing in pvc pipe that slips [ adjustment]  and prism glued at end with side notched. When using I tape small unhooded flashlight works well.
 Main thing was looking for was vent hole wear and erosion.
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Offline Double D

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Re: Borescope
« Reply #2 on: September 18, 2008, 03:35:45 PM »
Get a copy of The More Complete Cannoneer by Mathew Switlik, there are plans in the book for a bore scope.
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Offline and7barton

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Re: Borescope
« Reply #3 on: September 19, 2008, 12:01:34 PM »
Quote from: Articifer Tom on September 18, 2008, 03:16:33 PM
Yeah , made one years ago . went to flea market got front lens in its adjustable sleeve from old slide projector ,for magification. Then eye piece from telescope. When purchasing you can simply test by moving to and aft to see if you can focus on something as deep as your barrel, then at end used right angle prism from old bioculars .
  Mounted every thing in pvc pipe that slips [ adjustment]  and prism glued at end with side notched. When using I tape small unhooded flashlight works well.
 Main thing was looking for was vent hole wear and erosion.

That's what I want mine for. The price of a ready-made unit is way out of my range. I have a box full of prisms and lenses from various old binoculars and cameras. I was thinking of building a white LED lamp into the unit. So you didn't have a lens at the far end ? - just the prism ? - That makes it easier for a start !
I'll give it a try then, now I know it can be done.
Thanks
Richard
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Founder in 1986 of Historical Artillery Corps, later changed to Historical Artillery UK.
Builder of Cannons and models for South-Western Artillery, Fort Amhurst, Coalhouse Fort and private commissions.
Technical Consultant for two episodes of Scrapheap Challenge. Ex Pyrotechnic Safety Officer at Coalhouse Fort. I go trekking and survivalist camping - build experimental tents and survival equipment - caving.

Offline Articifer Tom

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Re: Borescope
« Reply #4 on: September 19, 2008, 02:15:35 PM »
 Yes , the eye piece and len are only about 10" apart,and slide for adjustment. Makes like a telescope to see prism.
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Offline and7barton

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Re: Borescope
« Reply #5 on: September 22, 2008, 12:19:48 PM »
Thanks for the info everyone. I built one today and it works just fine, if a bit on the fat side, but longterm I'll keep a lookout for a pukka military one anyway.
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Founder in 1986 of Historical Artillery Corps, later changed to Historical Artillery UK.
Builder of Cannons and models for South-Western Artillery, Fort Amhurst, Coalhouse Fort and private commissions.
Technical Consultant for two episodes of Scrapheap Challenge. Ex Pyrotechnic Safety Officer at Coalhouse Fort. I go trekking and survivalist camping - build experimental tents and survival equipment - caving.
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