Focal length guage

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Gene Uselman
Posts: 1305
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC1390
Laser Power: 130W EFR
Laser Bed Size: 36x49
Home Position: TR
RDWorks Version: V8.01.19 LO
Accessories: I have a combining lens, pin tables [homebuilt], honeycomb table [LightObject], wireless remote on the way [crossed fingers]
Windows Version: Win 7 Pro

Focal length guage

Post by Gene Uselman » Sat Jul 16, 2016 9:37 am

I thought I got this Idea from Russ S. but I must have gotten it on the WWW somewhere- anyway this is my redesign of it and it works very nicely.
The black on the bottom is where my machine normally will focus- you can move it to what ever your focus is. I darkened it with a magic marker for ease of location. I often focus lower (and sometimes higher) for thick substrates and it is easy to check with this gauge. The ribbon I did get from Russ- with a clear gauge- it is easy to lose.
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focal length guage mm.dxf
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User avatar
Gene Uselman
Posts: 1305
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC1390
Laser Power: 130W EFR
Laser Bed Size: 36x49
Home Position: TR
RDWorks Version: V8.01.19 LO
Accessories: I have a combining lens, pin tables [homebuilt], honeycomb table [LightObject], wireless remote on the way [crossed fingers]
Windows Version: Win 7 Pro

Re: Focal length guage

Post by Gene Uselman » Mon Jul 18, 2016 12:06 pm

Actually it was one of Russ' earlier vids- before the Learning Lab series. Mea Culpa.

User avatar
Gene Uselman
Posts: 1305
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC1390
Laser Power: 130W EFR
Laser Bed Size: 36x49
Home Position: TR
RDWorks Version: V8.01.19 LO
Accessories: I have a combining lens, pin tables [homebuilt], honeycomb table [LightObject], wireless remote on the way [crossed fingers]
Windows Version: Win 7 Pro

Re: Focal length guage

Post by Gene Uselman » Wed Jul 20, 2016 9:28 am

I apparently muffed the export- I work 'mostly' in inches, but RDworks even when loaded in inches- a lot of the stuff is in mm.
I am oldish and sometimes get confused. I will upload the correct file. Sorry and thanks for the poke, I need it. Gene

User avatar
Gene Uselman
Posts: 1305
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC1390
Laser Power: 130W EFR
Laser Bed Size: 36x49
Home Position: TR
RDWorks Version: V8.01.19 LO
Accessories: I have a combining lens, pin tables [homebuilt], honeycomb table [LightObject], wireless remote on the way [crossed fingers]
Windows Version: Win 7 Pro

Re: Focal length guage

Post by Gene Uselman » Mon Aug 22, 2016 5:53 pm

That seems like quite a FL- what lens do you use? Thanks Gene

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Keith Sherwin
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Posts: 1588
Joined: Fri Jun 24, 2016 3:44 pm
Location: Heart of Canada
Country: Canada
Nickname: Keith
Laser Machine Make or Type: POS China
Laser Power: 80
Laser Bed Size: 400 x 600
Home Position: TL
RDWorks Version: V8.01.23
Accessories: Hot dog roller, doHICkey Power Meter, Multi-Lens, High power exhaust, Interior filter soon.
Windows Version: W7 Pro

Re: Focal length guage

Post by Keith Sherwin » Tue Aug 23, 2016 9:26 am

I think Gene meant Focal Length. To do that, just focus the lens, then measure up from the focused surface to the bottom of the lens. That will give you thee "Approximate" Focal Length. The lenses seem to come in 1/2" (12.7 mm) increments:
25.4(1")
38 (1-1/2")
50.8 (2")
63.5 (2-1/2")
76.2 (3")
:idea: Started this forum.
Lead in creation of the RDWorksLab English Manual.
Cheers, :D
Keith

User avatar
Keith Sherwin
Site Admin
Posts: 1588
Joined: Fri Jun 24, 2016 3:44 pm
Location: Heart of Canada
Country: Canada
Nickname: Keith
Laser Machine Make or Type: POS China
Laser Power: 80
Laser Bed Size: 400 x 600
Home Position: TL
RDWorks Version: V8.01.23
Accessories: Hot dog roller, doHICkey Power Meter, Multi-Lens, High power exhaust, Interior filter soon.
Windows Version: W7 Pro

Re: Focal length guage

Post by Keith Sherwin » Tue Aug 23, 2016 9:57 am

Interesting method! I think the other method is way easier and you don't need rubber gloves for protection.
:idea: Started this forum.
Lead in creation of the RDWorksLab English Manual.
Cheers, :D
Keith

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