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Old 01-29-2013, 02:15 PM #1
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Question Big enough heatsink?

Hi LPF,

I'm planning on doing M140 build and I'm going to use a Guidesman host. I'm going to buy the FMT V2 from Cajunlasers set at 1.7A. Will I get a decent duty cycle at this current? I know DTR once did a 6 minute run at 1.5A with the same host (HERE). So do you think I will get a duty cycle above 1min runtime? in advance!


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Old 01-29-2013, 03:12 PM #2
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Default Re: Big enough heatsink?

If your looking at a guides man host you might check out the host I'm selling. Similar in design as how you build it, but has a bigger and takes larger battery's.
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Old 01-29-2013, 03:15 PM #3
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Default Re: Big enough heatsink?

Are you buying a host from somewhere, so that it has the solid aluminum block to hold the module? That's pretty key in ensuring that your host will adequately heatsink your laser.
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Old 01-29-2013, 03:31 PM #4
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Default Re: Big enough heatsink?

@awillis Your host looks great bit that's just a tad bit to expensive for me, and I like the fact that a Guidesman can take a 26650 battery

@Bionic-Badger I'm buying the host and heatsink from Cajunlasers (HERE), and the sink was is the same as the on machined by Eudaimonium (HERE), Again, the same as DTR's build.
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Old 01-29-2013, 03:45 PM #5
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Default Re: Big enough heatsink?

It only take a battery up to 25500 and only comes in red. I might be able to work on the price with you a bit.
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Old 01-29-2013, 03:53 PM #6
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Default Re: Big enough heatsink?

That host should work fine for your laser with that duty cycle.
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Old 01-29-2013, 03:57 PM #7
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Default Re: Big enough heatsink?

@awillis Eudaimonium's page says it can take a 26650 battery with a slight mod to the tailcap, and I rather like the color of the host. I really do like your host and it battery configuration! but no thanks, maybe in the future!

@Bionic-Badger What duty-cycle do you think I will be able to get? Thanks in advance!
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Old 01-29-2013, 04:04 PM #8
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Default Re: Big enough heatsink?

No problem, I understand I had got the same host but different color and had got a bad heat sink but cliff assured me it was the last one it ended up become a host for a 532nm eBay pen
Link in my sig.
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Old 01-29-2013, 04:08 PM #9
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Default Re: Big enough heatsink?

@awillis That build looks great! Did the heatsink come polished from clif?
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Old 01-29-2013, 04:10 PM #10
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Default Re: Big enough heatsink?

No that's something I did my self. Its not to hard to do just a bit time consuming.
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Old 01-29-2013, 04:13 PM #11
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Default Re: Big enough heatsink?

^ Thank you!
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Old 01-29-2013, 04:31 PM #12
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Default Re: Big enough heatsink?

I'm not too sure what duty cycle you can use, but maybe a minute or two. I'd feel how warm the thing is getting and try to gauge it from that.
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Old 01-29-2013, 04:33 PM #13
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Default Re: Big enough heatsink?

Thank you very much! And the off time, is that around half the on time? So on to off is 2:1?
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