[hackerspaces] Epilog laser cutter - focus lens replacement

[Sector67 Team]

We have a 150W CO2 laser and have been running the znse lenses from eBay,
they work fine.  They're spec'd by the diameter of the lens and the focal
range, so just pick the right diameter and focus length and you should be
in good shape.  MAKE SURE YOU PUT IT IN WITH THE DOMED SIDE TOWARDS THE
OBJECT TO BE BLASTED (flat side towards the tube).  For mirror replacement
some folks have had luck with metal hard drive platters but we haven't
tried them on ours (or higher wattage lasers, <75W have had success, I'm
guessing it's fine but it hasn't been tested yet).



Chris

Chris Meyer
Director
Sector67

608-241-4605
http://sector67.org

2100 Winnebago St
Madison, WI  53704


On Tue, Mar 25, 2014 at 7:10 AM, Peter Kuhm <peter at null.priv.at> wrote:

> Hi,
>
> Metalab has a 60W EPILOG Legend 36EXT since 2009-08-26
> http://metalab.at/wiki/Lazzzor
> we bought it as good as new (used only for showroom/fair)
>
> In Sept/Oct 2012 we had the aged laser tube changed and new we
> need to replace the focus lens (focus point in 2" distance)
>
> It is sort of consumable, was already not in best condition.
> cf http://asset-0.soup.io/asset/3878/2798_0db6.jpeg from last year
>
> But now someone used it w/o checking the lens condition and it
> cracked from to heat build-up due to carbon black deposits.
>
>
> My question: Epilog original spare part via German
> distributor costs us something like EUR 220/320 (excl VAT)
>
> Has someone on the list here used a different source and
> can share experience?
>
> beside physical dimension the focus length is important
>
> (we want to stick to the 2 inch).
> http://support.epiloglaser.com/article/8205/42831/focus-lens-101
>
> colleagues found much cheaper ones, e.g.
>
> http://www.alibaba.com/product-detail/Co2-Laser-Focus-Lens-Diameter-20mm_708952502.html
>
> Any comment on focus quality (narrowness of the spot) and how
> the alterative source can handle 60 Watt in continous service
> would be appreciated.
>
> Hack on,
> Peter
> _______________________________________________
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> Discuss at lists.hackerspaces.org
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>
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