Hi folks,
just wanted to show my idea of a PST40 mod 1 focuser.
Just a NEMA14 stepper controlled by Bob Browns MyfocuserPro2. Printed with PLA.
Works pretty nice and smooth.
Next steps:
- add a motor for the etalon adjustment
- add a second pcb for the second motor
- print a GT2 belt of TPU (to replace the rubber ring of the etalon for the GT2 belt)
Updates are coming soon.
PST40 motor focuser
- Bastelhannes
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- Bastelhannes
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- marktownley
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Re: PST40 motor focuser
Cool mod!
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Re: PST40 motor focuser
Neat job. Well done!
The PST's textured rubber ring provides plenty of grip for a GT2 belt.
[I used a "Skywatcher" DC focuser motor.]
However, it doesn't offer repeatable indexing for a stepper motor drive.
The PST's textured rubber ring provides plenty of grip for a GT2 belt.
[I used a "Skywatcher" DC focuser motor.]
However, it doesn't offer repeatable indexing for a stepper motor drive.
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
- Bastelhannes
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Re: PST40 motor focuser
Thank you.
I was thinking about using the original rubber ring of the etalon. But hey, I have a printer here, so why not using it? Hopefully I am going to have it built until Monday.
The only disadvantage so far: the pentaprism shifts while focusing. I am going to tear the black box open again. Last time i adjusted the pentaprism, because it had have an angle of about 15. It was not possible to rotate it over the edge so it would come into the desired position. I just cut it off and heated it together again (I was lacking of silicone glue).
Not good for flat frame making...
I was thinking about using the original rubber ring of the etalon. But hey, I have a printer here, so why not using it? Hopefully I am going to have it built until Monday.
The only disadvantage so far: the pentaprism shifts while focusing. I am going to tear the black box open again. Last time i adjusted the pentaprism, because it had have an angle of about 15. It was not possible to rotate it over the edge so it would come into the desired position. I just cut it off and heated it together again (I was lacking of silicone glue).
Not good for flat frame making...
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Re: PST40 motor focuser
Great addition to the scope...well done !!!
Brian
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10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
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2.2m Diameter Dome
iOptron CEM70G Mount carrying:
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Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: PST40 motor focuser
And... modified it:
- two motors (unfortunately two PCB myFocuser2Pro are necessary, attached to each side)
- used now high impact PLA (the green body) and carbon fibre PETG (the motor holders)
- for the moment I used TPU for the teeht ring (Etalon) and the belt itself...
Now waiting for the sun...
- two motors (unfortunately two PCB myFocuser2Pro are necessary, attached to each side)
- used now high impact PLA (the green body) and carbon fibre PETG (the motor holders)
- for the moment I used TPU for the teeht ring (Etalon) and the belt itself...
Now waiting for the sun...
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- Bastelhannes
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Re: PST40 motor focuser
By the way, if anyone needs the .stl or Fusioon360 files.. just drop a message. I am glad to share...
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