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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Jimmy Pryor
Phoenix, US
★★★★★ 5
Clear and powerful analysis.
Format: Paperback
The three books in Bowlby's trilogy on Attachment, Separation and Loss need to be read a whole. Using the studies and case histories of children being separated from their mothers and important others, in a wide range of circumstances from separations of only a few minutes, through separations of several weeks on up to prolonged and permanent separation due to divorce and death, Bowlby outlines a new way of understanding neurosis, psychosis and optimal, healthy functioning. Using the lens of a Darwinian analysis, and the case histories written up by psychoanalysts spanning decades, he compares and contrasts his new theory with that of previous psychological thought, especially the psychoanalytic tradition. I found his analysis penetrating and illuminating. It sets the stage and formulates the hypotheses for further research. Much of that research has now taken place and has borne out Bowlby's theories. Not all of it, of course. Because Bowlby's attachment theory became and continues to be such a foundational analysis for so much that has followed in its wake, from evolutionary psychology to child development to psychotherapy, it is a must read for anyone interested in these and related fields.
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Reviewed in the United States on November 7, 2012
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Hero
West Palm Beach, US
★★★★★ 5
A briliant book
Format: Paperback
This book is very neat in its specifics about the effects of absence when a mother is not in a child's life and the roles and effects of mother figures as well. Myself dealing with abandonment issues from my mom and my mother figure in my life, this book really assists in identifying the issues caused from the absent parent. Though the book doesn't offer any real advice as to deal with these problems that arise, it identify's the issues and allows you to further your research in progression. The writing style used can get rather complex though, be prepared for that. I agree with everything provided in this book and recommend it to anyone who's interested in either the psychological effects of absence of a parent, or seek to identify it themselves.
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Reviewed in the United States on April 9, 2011
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L Bond
Lake Worth, US
★★★★★ 5
The Attachment series is a brilliant trilogy.
Format: Paperback
It is so detailed - amazing.
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Reviewed in the United States on October 3, 2022
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Cavett
Houston, US
★★★★★ 5
Bowlby Books
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As an MFT graduate student, first hand accounts are important. For the price, add depth to your research writing as the theory intended. Bowlby makes separation axiety, child anger and anger clear. This is a good read even for those who are not in a clinical field. Worth a lot more too me than I paid.
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Reviewed in the United States on November 26, 2011
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Amazon Customer
Battle Creek, US
★★★★★ 4
Another piece to the triology offered by Bowlby
Format: Paperback
As with Bowlbys' other works, this classic furthers the hypothesis of negative emotional influence on the continued development of humans as we integrate with our social environments. I liked it...in fact, liked all of Bowlbys' writings.
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Reviewed in the United States on July 7, 2013

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