DPReview.com is closing April 10th - Find out more

Looking for ideas to build a continuous AF performance testing rig..

Started Jan 15, 2019 | Discussions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,147
Re: Looking for ideas to build a continuous AF performance testing rig..

Kapil Kapre wrote:

2) Have a servo motor to mechanically move the platform at varying speeds/accelerations with ways to start/stop and control the movement precisely. Ideally I'd like to be able to move the platform at around 20-30 meters/second at peak. I was looking at a few DIY CNC rigs that have similar components, but I don't think they need this kind of speed.

Normally, they're doing something like 200mm/s, which is 1/100 what you want. However, 100X is easy to do with a larger diameter connection to the drive belt. Catch is, it will not deal with much weight that way.

Also keep in mind, acceleration is the really big problem, not speed.

There are much beefier steppers and servos if you need to move significant mass.

 ProfHankD's gear list:ProfHankD's gear list
Canon PowerShot SX530 Olympus TG-860 Sony a7R II Canon EOS 5D Mark IV Sony a6500 +32 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow