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I get that - I think some of the difference is that I hadn't lapped the
bearing in the further worm block for a sliding fit in the earlier data

I no longer have the PHD2 log files for the 2014 PecPrep data.

I've uploaded the log files from yesterday to the website:

</g/Losmandy_users/files/David%20Partridge/PHD2_GuideLog_20
20-04-24_175626.txt>

David

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Magnus Larsson
Sent: 25 April 2020 14:42
To: [email protected]
Subject: Re: [Losmandy_users_io] McLennan gearbox PE results

Hi!

That is really impressive. And a bit odd, isn't it? If I read the graphs
correctly, the first fundamental is far lower in your second situation
(the McLennan boxes). But that fundamental should in principle not be
dependent on gearbox, should it? I mean, the gearbox would contribute
other frequencies, but not the 239 sec one (that seems ti be 243.7 secs
in your graph).

Would it be possible for you to share the PHD2 logfiles, just to play
with and compare with mine in PEMPro log viewer?

Magnus


Den 2020-04-25 kl. 13:35, skrev David C. Partridge:
> You may remember that not long ago I replaced the Losmandy gearboxes on my
> G11 (which had seen better days) with McLennan gearboxes.? All I was able
to
> say at the time about possible improvements was that they were a LOT
> quieter.
>
> Last night was the first opportunity I've had to record the PE data since
I
> fitted the McLennan gearboxes.
>
> I used PecPrep to record the PE over almost six worm cycles, and the
results
> were quite? excellent - far better that I could have hoped for.
>
> With the original Losmandy gearboxes the results I obtained were quite
good:
> 4.83 arc-seconds Peak to Peak
>
>
</g/Losmandy_users/files/David%20Partridge/Before%20PEC%20T
> raining.PNG>
>
> The results from last night by contrast were nothing short of outstanding:
> 1.6 arc-seconds Peak to Peak (RMS 0.33 arc-seconds)
>
>
</g/Losmandy_users/files/David%20Partridge/24%20April%20202
> 0%20PE.png>
>
> This is so good that quite honestly I don't think I'll bother with PEC
> training.
>
> Note that I didn't edit the PecPrep files to enter the gearbox information
> for the McLennan gearboxes (though that wouldn't change the results).
>
> This is using the original worm (not the HP worm) and twin worm blocks,
> ABEC-5 bearings, a Belville washer in the block furthest from the gearbox
> and the bearing in that worm block lapped to a sliding fit.
>
> Keep well and clear skies
> David
>
>
>
>
>