When you are setting up a coordinate measuring machine for dimensional metrology machine inspection, the accessory list can pull you in two very different directions. One side is a precision illumination unit that supports optical edge detection. The other is a mechanical clamp that holds a workpiece in place. Both can make measurements more consistent, but they solve different problems. The right choice starts with how your inspection hours are actually spent.
Quick Verdict
If your inspection routine leans on non-contact optical measurement for a Mitutoyo BHN506, the Mitutoyo Scope CF20 Optical Light Source is the purpose-built component that keeps the view bright and stable. If your routine is more about repeatable physical fixturing, the DANTECH CMM Tension Clamp provides a straightforward hold at a much lower cost.
At a Glance
| Product | Price | Price Indicator | Condition | Best For |
|---|---|---|---|---|
| Mitutoyo Scope CF20 Optical Light Source | USD 2,698.00 | Used | Non-contact optical measurement on BHN506 CMM | |
| CMM Tension Clamp M6 Spring Fixed Pole | USD 26.00 | New | Holding workpieces securely during inspection |
Where Each Product Wins
- Mitutoyo Scope CF20 Optical Light Source wins when your CMM station already uses the CF20 microscope assembly for non-contact checks. Its low-heat design helps prevent thermal distortion, which matters when accuracy has to hold over longer inspection runs.
- DANTECH CMM Tension Clamp wins when you need a dependable way to keep parts from shifting during probing. The spring-loaded M6 design and its included post give you a simple repeatable setup for workpieces of different sizes.
Product Notes
Mitutoyo Scope CF20 Optical Light Source for Mitutoyo BHN506 CMM
This is the illumination unit that matches the Mitutoyo BHN506 CMM, so it fits into an existing CF20-based optical setup. It delivers bright, uniform light for edge detection and non-contact inspection, and the low-heat design helps prevent thermal distortion that can skew precision measurements. The unit comes from Japan and is a used unit, so it suits a shop that already works with this microscope assembly and wants a matching replacement component. The main limitation is that it serves the optical side of inspection rather than the fixturing side. You also need to plan around the used condition and a price that puts it in a different category than basic tooling. If your process is optical, it is the specific part to consider; if you need mechanical holding, this light source won't help.
CMM Tension Clamp/Inspection Tooling M6 Spring Fixed Board Fixed Pole L87mm
The tension clamp solves the other half of inspection: keeping the part still. It uses an M6 threaded post and an 87 mm tension clamp with a 78 mm post, and the package includes one clamp plus one post, so there's no need to source extra pieces for a basic setup. It holds any size part, making it a flexible add-on for a machine that handles different workpieces throughout the day. What it doesn't address is optical measurement, edge detection, or lighting; those tasks stay with separate components. The 87 mm working length defines the physical range you have to design your fixture around. If your priority is a simple, repeatable hold-down for touch probing, this new component is a direct and inexpensive answer.
Final Choice by Use Case
For optical multi-sensor inspection, the Mitutoyo Scope CF20 Optical Light Source is the part to choose. It is specifically designed for the BHN506 and the CF20 microscope assembly, and it brings stable illumination to edge-detection work. For manual or automated probing, the CMM Tension Clamp is the practical pick. The $2,672 price gap between the $2,698 light source and the $26 clamp makes sense because you are buying two different capabilities: precise lighting versus mechanical holding. A shop doing non-contact optical work will get real value from the light source; a shop that mostly needs repeatable part positioning will get immediate payoff from the clamp.
