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Jeffrey Sugden
professor emeritus
Reged: 05/04/05
Loc: Akron, OH
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EQ6 PE at 10. and 5.1 Seconds
#3023908 - 04/04/09 01:38 PM
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I ran an autoguider test the other night and ran a log as well. Running the log through PECPrep, I find the following:
Period Mag Phase PE
454.1 37 -50
272.4 26 -141
154.2 30 -140
118.4 26 69
93.9 24 3
67.5 24 -129
43.5 24 -137
40.1 21 -48
21.3 20 100
20.1 22 -38
17.0 22 60
11.1 22 -84
10.3 34 -136
10.2 100 128
5.2 21 93
5.1 21 -36
5.1 40 139
5.0 23 22
5.0 23 -51
I am guessing the 10 second and 5 second is caused by the transfer geartrain teeth. How do I accomplish that?
Thanks,
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Mert
Post Laureate
Reged: 08/31/05
Loc: Spain, Pamplona
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Re: EQ6 PE at 10. and 5.1 Seconds
[Re: Jeffrey Sugden]
#3025509 - 04/05/09 11:48 AM
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Hi Jeffrey,
The 10 second ( 10.1 ) is the tooth to tooth contact
period caused by the stepper rotation ( 122 seconds ).
On the 5 second, I don't know, but likely these are
harmonics of the stepping frequency.
I see there are still components of the worm-period
and it's spurgear present as well as the stepper.
Did you use PEC during guiding?
Edited by Mert (04/05/09 12:20 PM)
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Jeffrey Sugden
professor emeritus
Reged: 05/04/05
Loc: Akron, OH
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Re: EQ6 PE at 10. and 5.1 Seconds
[Re: Mert]
#3026599 - 04/05/09 09:17 PM
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No. I just used PHD and an Orion autoguider. The tooth to tooth noise is on the order of 5 times bigger than most of the other noise. I think if I can get rid of that I will be in real good shape.
Do you have any ideas about how to reduce or eliminate that part of the noise?
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ccs_hello
Postmaster
Reged: 07/03/04
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Re: EQ6 PE at 10. and 5.1 Seconds
[Re: Jeffrey Sugden]
#3027155 - 04/06/09 07:35 AM
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Jeff,
10.2 is caused by 12 tooth stepper output gear (122 second stepper full rotation cycle) touching the transfer idler gear. Belt drive is suggested (hpcgears.com in UK has the 47-tooth pulley).
Clear Skies!
ccs_hello
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Mert
Post Laureate
Reged: 08/31/05
Loc: Spain, Pamplona
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Re: EQ6 PE at 10. and 5.1 Seconds
[Re: Jeffrey Sugden]
#3027717 - 04/06/09 12:55 PM Attachment (31 downloads)
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You might try another solution which requires some
machining but IMHO seems to work fine.
The amplitude of the 10.2 second in guided log
dropped to aprox. 0.3".
I use 47 teeth transfer gear and a new machined
RA-assy plate as well as transfer gear running on
a bearing. ( on the left the 36 tooth gear and on
the right the 47 tooth transfer gear )
Regards,
Edited by Mert (04/06/09 01:07 PM)
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