The P6, as published
A six-axis frame on geared screw actuators, sold as a kit: $9,999 buys the motion platform and its rig; seat, wheel and pedals are extra.
Compare · DOFReality
Both are kits.
The difference is inside
the actuator.
DOF Reality's six-axis platforms and ARK's Portal Development Kit (PDK) share something most of this page set does not: both arrive as a kit you assemble.
Development Kit: early-access hardware, software in active development.
Side by side
Same delivery model, different load path.
| DOFReality H6 / P6 | ARK PDK | |
|---|---|---|
| Delivery | Kit, self-assembled | Kit, self-assembled |
| Architecture | Six-axis frame with front and rear roll centers | 6DOF Stewart-Gough, six legs in parallel |
| Actuation | SFU actuators with a gearbox on each motor, as published | Direct-drive BLDC, no gearbox, no screw, no belt |
| Transmission play | Inherent to a geared, screw-driven load path | None by architecture — no transmission to have any |
| Feedback | As published by the manufacturer | 21-bit absolute magnetic, 2,097,152 positions per revolution |
| Control | Two control boxes, three motors each, USB to the PC | Three ArkDrive controllers, two motors each · CAN bus to the drives · Ethernet to the PC |
| Control rates | Not stated by the maker | 1 kHz game to motion · 3.3 kHz control loop · 8 kHz drive loop per motor |
| Static load | Carried by the actuators | Carried pneumatically, patented technology |
| Price | P6 from $9,999, as published | Development-kit price: $8,499.99 PDK + ARK Ecosystem, adds wheelbase, wheel, load-cell pedals and button box · $6,299.99 PDK Racer, chassis included · $4,899.99 PDK, flat top |
Figures in the other column are read from the manufacturer's published material, with source and retrieval date. Manufacturers revise specifications — if one here is out of date, tell us and it gets corrected.
Sources and retrieval dates
Sources: DOF Reality — Motion Racing Rig 6-Axis PRO (P6), dofreality.com, retrieved 13 September 2026 and 27 September 2026; DOF Reality — FAQ, dofreality.com, retrieved 13 September 2026.
Kit for kit
The PDK + ARK Ecosystem
Development-kit price for qualified recipients: $8,499.99, for the platform, the aluminum racing chassis, extension feet and table, and our direct-drive wheelbase, wheel, load-cell pedals and button box, matched and tuned as one system. You add the seat, PC and screen.
Built to allocation for qualified recipients · ready to ship an estimated 3–6 months from order confirmation; delays of up to 12 months are possible
Inside the actuator
No gearbox, screw or belt in the PDK's load path: a direct-drive leg reverses the moment the current does, with a 21-bit absolute encoder on every motor. The standing weight rides on air by patented technology, so the motors spend their current on motion.
Keep reading
What datasheets leave out
The method behind this page, applied to us before anyone else.
Backlash
The specific defect a geared screw drive has and a direct drive does not.
The Ecosystem
What arrives in the box, and what you assemble.
Every build starts with this platform. The PDK + ARK Ecosystem development kit finishes it: racing chassis, wheelbase, wheel, load-cell pedals and button box. Development-kit price for qualified recipients: $8,499.99.
Order a development kitAll four builds ›
Built to allocation for qualified recipients · ready to ship an estimated 3–6 months from order confirmation; delays of up to 12 months are possible