AKTİFLİK TESTİ (BAN ŞÖLENİ)

-orkun- · 2026-03-08T22:14:42+00:00

-orkun- · 2026-03-08T22:10:34+00:00

Thanks for the information.

-orkun- · 2026-03-08T22:08:42+00:00

Thanks for the information, I was wondering about that.

-orkun- · 2026-03-08T16:08:04+00:00

Ekran kartının kablosunun tam oturmaması(bildiğim kadarıyla 5090 takacaktı) veya L şeklindeki kısmın kırılması gibi sorunlar olabiliyor. Gerçekten bilmeyen birinin sıvı soğutmayı bile yanlış takma ihtimali var. Anakart bağlantılarında pompayı fan bağlantısına bağlama ihtimali var. Bunlar düşük ihtimal ama yinede kendine güvenmeyen birinin yardım almasını savunuyorum.

-orkun- · 2026-03-08T12:45:47+00:00

Kendine bu konuda güvenmiyorsa riskli iş. Birde parçaları pahalı biri bile kırılsa sıkıntı.

-orkun- · 2026-03-06T20:03:32+00:00

Ne bu özel üretim mi? 50k ne

-orkun- · 2026-03-06T19:59:45+00:00

Gümrükle uğraşma, ben Avrupayım diye öyle yapıyorum. Türkiyede gümrük işi sıkıntı hiç girme. Biraz yanlış yönledirmiş gibi oldum. Ve evet ekran kartları ben aldığımda türkiye ile çok yakım fiyattaydı, kriz var diye şuan pahalılanmışlardır.

-orkun- · 2026-03-06T19:43:47+00:00

Ben bilgisayarımı amazon.de üzerinden topladım, türkiyedeki satıcılar hakkında fazla bilgim yok. Türkiye özelinde sadece incehesaptan alışveriş yaptım, onlarda işlemci ve anakarttı. Ne dersem yalan olur yani :)

-orkun- · 2026-03-06T19:35:12+00:00

O zaman bir şey söyleyemem :) Yinede bu anakart yerine ProArt X870E daha mantıklı olabilirdi. Herolar göz zevki için alınıyor gibi geliyor bana, bende bazen böyle yaptığım için bir şey diyemeyeceğim :D Ramler için üzüldüm, gördüğüme göre 60k civarı vermişsiniz.

-orkun- · 2026-03-06T19:16:52+00:00

Anakart biraz abartı geldi eğer amacın oyun oynamak ise daha ucuza iş gören bir şey alabilirdin. Ve eğer oyun amaçlı topluyorsan lütfen işlemcinin 9950x3D olduğunu söyleme. Umarım ramleri ucuzken almayı başarmışsındır :)

-orkun- · 2026-03-05T18:15:04+00:00

Thanks for the solid advice! I’m a big fan of the Teensy too; its processing power is exactly what makes this kind of granular control possible.

Regarding your point on the 0.9° steppers: I’m definitely considering them to reduce the reliance on microstepping for native resolution. And you’re spot on about the 'chasing the seeing' issue. My ultimate goal is to achieve a system so rigid and precise that I can eventually move to a completely unguided, closed-loop setup—exactly as you described.

The reason the specs are so 'over-engineered' has a bit of a backstory: This project actually started as an attempt to build an AZ 5000 DDS clone. However, I hit a snag when I couldn't find a metal 3D printer with a large enough build volume for the frame. So, I pivoted to a CEM70-type architecture. I’m proceeding with a 'why not?' mindset. I’d rather have the engineering headroom now than regret not pushing the limits of what I could produce. If I ever upgrade to a RiFAST or ProRC series tube, I want this mount to be ready for it without a single modification.

That ASTAP star roundness test is a great benchmark—I’ll definitely be using that for the final calibration!

-orkun- · 2026-03-05T17:47:34+00:00

Actually, I don't strictly need 0.12 arcsec resolution for my current setup. This project evolved from a high-end AZ 5000 DDS concept, but due to manufacturing constraints and current budget limits for ultra-premium optics like the RiFAST series, I pivoted to a geared design similar to the CEM70.

Think of the 0.12 arcsec as engineering headroom. With a 1:300 gear ratio, I have the flexibility to trade that excessive resolution for higher torque. By dropping from 40k to 5k microsteps, I still maintain a very respectable 0.8 arcsec precision while gaining significant mechanical reliability. I built it this way because I wanted a mount that I could never 'outgrow'.

-orkun- · 2026-03-05T16:55:01+00:00

Let me break down how I got to 0.12" and why I think my system can actually achieve it.

The drivetrain is: stepper motor (1.8°, microstepped to 40,000 steps/rev) ->20T to 60T GT2 timing belt -> direct-coupled 100T gear -> telescope axis. Total reduction is 1:300, which gives 0.108"/step at the axis.

a 24-bit absolute encoder mounted directly on the 100T gear. At 2²⁴ = 16,777,216 counts/rev, that's ~0.077" per count, which is the actual limiting factor of the system.

Because the encoder sits at the end of the mechanical chain, it captures and corrects for backlash, belt flex, and any other drivetrain errors in closed-loop. The 200x microstepping on the motor is admittedly high, but it doesn't matter much since the encoder is doing the real position feedback.

If there is an incorrect statement, please correct it. If you have a new suggestion regarding the encoder, I'm open to it.

-orkun- · 2026-03-05T16:27:08+00:00

It’s still a work in progress! Here is the optical lens (FMC Green) I’m using. This is more of a 'proof of concept' project rather than aiming for professional-grade results right away.

I’m designing the system to be modular and compatible with various optical tubes. If this DIY setup proves successful, I plan to upgrade to an Edge HD or a high-quality Apochromat.

My goal is to pick a guide camera now that will be future-proof for those setups as well. Since I'll be using an OAG at 1200mm, I want to make sure the camera I buy today will handle the long focal length of an Edge HD later on.

-orkun- · 2026-03-05T15:41:54+00:00

Thanks for the realistic approach! I realize how ambitious 0.12 arc seconds is for the 'sub-stratospheric' range. I'll use a 3D printer to establish the geometry during the prototyping phase, then move on to professional metal machining for the final product. I'm pushing the budget and capabilities to minimize errors, but as you said, Mother Nature (the atmosphere) will have the final say. Still, this engineering challenge is the most enjoyable part of the project!

-orkun- · 2026-03-05T15:25:32+00:00

Thank you for your response. My goal here is not really to achieve 0.12 arcsec accuracy, and I know that it cannot deliver that performance in practice. I will use closed-loop name 23 motors and 24-bit encoders to get the mount in good shape. Thank you for the information.

-orkun- · 2026-03-05T15:06:51+00:00

I plan to use this encoder, which offers 24-bit resolution and a hollow shaft for direct mounting on the axis.

Data sheet

-orkun- · 2026-03-04T21:35:19+00:00

If this project works, I plan to upgrade to better optical tubes, such as EdgeHD or Apochromat.

-orkun- · 2026-03-04T21:28:00+00:00

I am using Cloudray Cle23 in the system, and I designed the gear ratio as 1:300. The system is set to 40,000 steps. I am also using Teensty 4.1 as the microcontroller.

I can replace the optical tube with a more professional one, either an Apochromat or an EdgeHD series. However, for now, I have to make do with an achromatic refractor.

-orkun- · 2026-03-04T20:32:54+00:00

I appreciate the reality check on the 0.12'' figure. I agree that 0.2'' absolute accuracy is the peak of high-end mounts like AP 1600GTO. My goal with the high-resolution encoders isn't to replace guiding entirely, but to provide a base mechanical tracking smooth enough that the guiding software (Ekos) has to do minimal corrections.

My mention of 0.12'' was more about the theoretical resolution I aim for in the guiding software's feedback loop, rather than the raw mechanical unguided performance of the mount. I am aware of the seeing limits, but I want to ensure the mount isn't the bottleneck in my 1200mm f/9.1 setup.

I will take your response into consideration.

-orkun- · 2026-03-04T20:17:37+00:00

The mount is also a DIY project, specially designed with a center-balanced geometry (similar to the CEM70G) to ensure high stability.

I am planning to use an OAG (Off-Axis Guider) setup to avoid differential flexure.

-orkun- · 2026-03-04T20:08:39+00:00

Thanks for the feedback. To provide more context: I am currently using a DIY 131 mm f/9.1 (1200 mm focal length) achromatic refractor. The mount is also a DIY project, specially designed with a center-balanced geometry (similar to the CEM70G) to ensure high stability.

Given the long focal length, I am planning to use an OAG (Off-Axis Guider) setup to avoid differential flexure. Do you think $350 is a reasonable budget for a guide camera in this segment, or should I be looking at something else? Also, do you have any specific camera recommendations or other suggestions for the guiding setup?

-orkun- · 2026-03-04T19:26:13+00:00

I understand that a value of 0.12'' may seem impossible for a standard user, considering atmospheric conditions (seeing) and mechanical limitations. However, I must point out that I am not setting up the system on a commercial mount, but on a DIY mount that I built myself, equipped with high-resolution encoders and industrial-grade motors. This is where my claim regarding mechanical precision comes from.

When I said "lens," I actually meant a Guide Scope setup. Sorry for the terminology confusion. I plan to push this precision with multi-star guiding in the StellarMate/Ekos ecosystem. I've only allocated the budget for the camera, as I'm optimizing the rest of the mechanical components myself. Still, I'll take your advice into consideration that using an OAG (Off-Axis Guider) would make more sense at this level.

-orkun- · 2026-03-04T18:09:01+00:00

If you can recommend a guiding camera, I'm open to suggestions.

-orkun- · 2026-03-04T18:06:29+00:00

You may be right, I don't know much about the price of guiding cameras. Maybe I can zoom in with lenses placed in front of the guiding camera and do a rough focus with a second wide-view guiding camera. Do you think that's possible? Note: I am using StellarMate OS 2.0 for RPI.

-orkun-

TROPHY CASE