SKU: 68006697169

Blackmagic Design Spares - Camera URSA Mini - Main Chassis

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Description

Blackmagic Design Spares - Camera URSA Mini - Main ChassisThe Blackmagic Design Spares Camera URSA Mini Main Chassis is the central "skeleton" of the camera system. Unlike the side panels or the top escutcheon, which are exterior skins, the Main Chassis is the internal structural frame that everything elsethe sensor, the global shutter mechanism, the cooling system, and the primary circuit boardsbolts onto. It is precision engineered to provide the absolute rigidity required for a professional cinema camera.

The Blackmagic Design Spares - Camera URSA Mini - Main Chassis is the central "skeleton" of the camera system. Unlike the side panels or the top escutcheon, which are exterior skins, the Main Chassis is the internal structural frame that everything else—the sensor, the global shutter mechanism, the cooling system, and the primary circuit boards—bolts onto.

It is precision-engineered to provide the absolute rigidity required for a professional cinema camera.

The Foundation of Optical Precision

The most critical role of the chassis is maintaining the Flange Focal Distance.

  • Zero Flex: The chassis ensures that the distance between the lens mount and the sensor remains constant to within microns ($0.001\text{mm}$), even when a $15\text{kg}$ cinema zoom lens is mounted to the front.

  • Thermal Sink: The magnesium alloy is designed to draw heat away from the sensor block and transfer it toward the "wind tunnel" where the fan can exhaust it.

  • Grounding Plane: The chassis acts as a unified electrical ground for the entire camera, reducing the risk of static interference or "hum" in the audio and video signals.

Compatible Models

The chassis is the core of the "Mini" form factor and is shared across:

  • URSA Mini 4K / 4.6K

  • URSA Mini Pro 4.6K (G1 & G2)

  • URSA Mini Pro 12K

  • URSA Broadcast / Broadcast G2

When to Replace the Main Chassis

Replacing the chassis is a "Level 3" (Total Strip-down) repair. It is usually only necessitated by catastrophic events:

  • Structural Cracking: Magnesium is incredibly strong but brittle. A high-velocity impact (like a camera falling off a tripod onto concrete) can crack the frame. Once the frame is cracked, the lens mount will no longer be "square" to the sensor, making it impossible to achieve sharp focus across the entire frame.

  • Stripped Internal Standoffs: If the internal threaded standoffs that hold the Main PCB or the Sensor Block are stripped or snapped, the internals will "rattle," leading to intermittent electrical failures or sensor misalignment.

  • Fire or Extreme Heat Damage: If a camera is caught in a fire or suffers a major electrical short that melts internal mounting points, the chassis must be replaced to ensure the safety and alignment of new components.

  • Corrosion: In extreme maritime environments, if salt water enters the camera, it can cause "pitting" in the magnesium. This can eventually compromise the structural integrity of the mounting points.


Technical Installation Note: The "Total Rebuild"

Replacing a chassis is effectively building a new camera using the "guts" of the old one.

  • The Sensor Block: The most delicate part of the transfer is moving the sensor assembly. This must be done in a clean-room environment (or at least a very high-quality dust-free workspace). Any dust that gets between the sensor and the chassis during the move will be visible in every frame you shoot.

  • Thermal Paste/Pads: You must replace all internal thermal interface materials. The old pads will be compressed and dry; using them in a new chassis will lead to immediate overheating issues.

  • Screw Mapping: You will be removing over 50 screws of varying lengths, diameters, and thread pitches. Mapping these is mandatory. Using a long screw in a chassis hole intended for a short one can punch through and destroy the Main PCB.

  • Shimming: After a chassis swap, you must re-check the flange distance. Even with a precision OEM chassis, the stack-up of tolerances means you will likely need to re-shim your lens mount to ensure your "infinity" focus is accurate.

Expert Advice: If your camera body is simply scratched or scuffed, do not replace the Main Chassis. Instead, look for the Right/Left Side Panels or the Top Escutcheon. You should only undertake a chassis replacement if the camera has suffered a structural failure that affects the image or the ability to mount lenses securely.

Did the camera suffer a major fall, or are you seeing "softness" on one side of your image that suggests the mount is no longer square?



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SKU: 68006697169

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Color: Black, Size: Medium
Good fit, good thickness, keeps feet warm and dry, no uncomfortable seams. I've only washed them twice, but will return if items don't hold up. So far they're proving to be a good investment.
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After wearing a couple times there is a hole in the heel. I think they're made of tissue paper;
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I need something that was soft for my three year old and this ball is super great, it not only is the right size but it also fits in his mouth just right. Although he is a super aggressive chewer, the ball toy hasn't been totally destroyed yet and it is easy on his gums. The ball is so durable that got two of these toys just for fun.
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WMiracle
Cuba, US
★★★★★ 5
The best!
UPDATE: 08/05/2025 - This is still one of my dog's 2 fav training/play toys. A couple of notes: 1. This is not a chew toy. If your pup is chewing up the rope, that's on you. That being said, you can get 100' of the poly cord rope at Home Depot for like $4.98. You can make nearly 100 ropes out of 100'. How hard is it to replace the rope????? 2. My pup is a now 15 month old Malinois. His original balls, purchase in September 2024 are still in everyday, multiple times per day, play. I did get careless and leave one where he got it and chew the rope. Easily replaced. Nothing to fret over. Yes, that was on me! 3.The foam ball is virtually indestructible! Replace the rope! 4. I noticed the price for the yellow large went from $12 each to $24. THIS will cause me to go elsewhere if they doubled in price. I LOVE these balls but not that much. I noticed they have a new yellow ball that has a strap vs. a rope. I might try that if I need one, but I have 6 of these balls, 2 never used yet, 2 that are virtually new looking, and 2 that have been in play since september 2024. I don't think I'll be buying more any time soon, but if I do need more, I hope they haven't gone up to $24 each. One of my top, go-to training tools. Quality is great other than the shrink wrap around the string joint. It's junk but not essential. Great tug and fetch toy. Essential to teaching a good "out" command (2 are recommended for this).
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Rosalie
New York, US
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Best dog ball
This is our go to dog toy for our German shepherd. its great for training in sports as well as outings at the beach, considering it floats! Never had him destroy one, so its extremely durable. I like that its a bright color so its easier to locate when i accidently let go of the rope too late and end up whipping it 20 ft into the woods. Easy to clean, all around just a great toy. Also love the large size as having a dog accidently lodge a ball into its throat is a real fear of mine, I do not have to worry about that with this toy. I should also mention the rope is a must, as touching a slobbery ball isn't the greatest feeling in the world and it puts your hands out of harms way. I will forever order these.
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Reviewed in the United States on September 7, 2025

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