When you're sourcing parts for an industrial robotics cobots line, the first fork is component type: do you need the motion side or the control side? This head-to-head puts a used Staubli RX90 CS7 controller against a used Denso HMS-40704M-W arm. The listed price gap is USD 1,749.99, with the Staubli controller at USD 2,499.99 and the Denso arm at USD 750.00. Neither is a complete robot as-is, which is exactly why they make such an instructive comparison.
Quick verdict
The Staubli RX90 CS7 is the clearer pick when you already have an RX90-based system and need a CS7 control unit. The Denso HMS-40704M-W is the better source when you want a Denso arm as a parts donor or as hardware to re-control yourself.
At a glance
| Listing | Listed price | Condition | Axis count | What you're buying |
| Staubli RX90 CS7 6-Axis Industrial Robot Arm Controller 1997 *READ* | USD 2,499.99 | Used | 6 | Robot arm controller |
| 2018 Denso HMS-40704M-W 4 Axis Industrial Robot Arm | USD 750.00 | For parts or not working | 4 | Robot arm, sold for parts |
Where each listing fits
The Staubli controller belongs in a conversation about replacing or matching a CS7 unit. Its part number, CS7 RX90, and its listing as a controller make it a part-specific purchase. If your setup is organized around an RX90 arm, this listing is the control component to compare against your inventory.
The Denso arm fits a different shopping basket. It is a mechanical arm sold as a single component, with the part number 410400-3450 making it easy to identify. That makes it a candidate for a parts-donor role, a spare articulation unit, or a re-control experiment, but not a plug-and-play arm.
Product notes
Staubli RX90 CS7 Controller
The Staubli listing is a used controller with a Standard construction type, explicitly identified as an RX90 CS7 controller. That part-number clarity is the main reason to choose it: if you are matching a CS7 controller to an RX90 arm, the listing tells you exactly which control unit you are buying. The limitation is the physical wear described in the listing: the controller has a dent on the corner and a missing key. You are buying a used controller rather than a complete arm, and the visible damage should be weighed against your tolerance for that kind of wear. This makes it a targeted component purchase for someone with an RX90 arm already in place.
Denso HMS-40704M-W Arm
The Denso arm is a 2018 four-axis unit with an HMS-40704M-W identity and part number 410400-3450. The strong reason to choose it is the 2018 build year combined with "good overall cosmetic condition" as described by the seller. The limitation is the condition flag: it is listed as "For parts or not working" because the seller does not have the controls for it. That means you are buying the mechanical arm without a control path in the listing, so plan for a parts-donor project or supply your own control solution. If you have a control approach already, the arm's 2018 manufacturing date gives you a useful mechanical base to work from.
Final choice by use case
- If you need a CS7 controller to pair with an RX90 setup, start with the Staubli RX90 CS7 controller listing.
- If you need a Denso arm to re-control or use as a parts source, start with the Denso HMS-40704M-W arm listing.
