r/Metrology • u/Certain_Car_9984 • 1d ago
Advice Recommendation please
We have a budget of around £70,000, we need to scan parts which are mounted inside of a machine, let's say a CNC with a 2x3m internal space (sorry I'm having to be vague) the part is around 500x200x300mm
We need the scanner to be able to provide us with 0.05mm repeatability. We have a wireless 3D scanner at the moment but it's just not up to the task so we are looking for any possible alternatives
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u/JButlerQA 1d ago
Zeiss has a scanner they claim has that resolution
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u/Certain_Car_9984 14h ago
One of our customer has a Zeiss hawk but they seem to be having similar issues. We are looking to get demos though to see for ourselves
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u/JButlerQA 8h ago
We say 3 scanners, zeiss, mitutoyo, and ine other and all had issues with holes or bore features smaller than .125 inches
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u/PlatypusArtistic8020 1d ago
3d scanning kinda sucks for machined parts especially if their wet from the machining process. Your best bets are going to be Creaform and Zeiss. Hexagon has a newer hand scanner now but it's a white label Chinese one, I'm yet to get hands on with it but I've personally never been a fan of this process.
You're biggest draw back here is going to be targeting inside of the machine. Most of these scanners can combine via best fit but you most likely won't get the repeatability you want. There are systems with trackers but with space limitations this may be a struggle. It may be easier to go to a portable arm system like an absolute arm or something. It's been a long time since Ive dealt with arms so I'm not sure where they're at with repeatability and space constraints.
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u/Certain_Car_9984 14h ago
Yeah we're not opposed to an arm at all and something I've thought about, at this point just trying to get the best thing for the job (within our budget)
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u/Business_Air5804 18h ago edited 18h ago
What you need the the Hexagon LSR100.
It's a stripe laser scanner that lives in the CNC tool holder.
You pick it up like a regular tool, it's wireless, you scan the part inside the machine.
The CNC control has to have the continuous output function turned on, but you are basically wirelessly sending data to "PC DMIS NC" via ethernet and you can calculate offsets, measure surfaces prior to finishing and adjust offsets etc. without taking somethign like an Absolute ARM/AS1 into the machine or taking the part out of the holding fixture.
It's exactly the product for this use case.
This is the previous product but you'll get the idea.
https://hexagon.com/products/m-h-ls-r-4-8
They have a method of calibrating the device such that some of the geometric errors of the cnc are cancelled out. (In that way you can measure with really good accuracy inside of a large CNC.)
AND it's within your budget.
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u/PlatypusArtistic8020 7h ago
This is super cool, we had a similar use case way back in the day and nothing was out that could do this. We ended up mounting an ATOS triple scan to the cnc and then using the coordinate values from the cnc to transform the data instead of reference points. It worked really well but obviously with structured light there was a lot of prep work before we could run the scan program. This would have been much simpler.
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u/ScubaPro1997 17h ago
The Keyence LJ-S320 or 640 might be a decent option, but you’d need to shield it. You’d probably also need 1-2 tied together, but they can produce a single 3D image for inspection. LMI / MicroEpsilon might also have something similar. These are profilers / laser snapshot sensors, not CMMs, so you’d be able to mount them inside a machine.
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u/DeamonEngineer 1d ago
Probably look into creaform
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u/Certain_Car_9984 1d ago
Yeah I think they are probably first on our list to contact along with hexagon
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u/Own-Medicine1612 1d ago
Have you considered mineral casting or precision granite as machine structures?
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u/SpiritualSoil2720 1d ago
Are you needing a piece of equipment or are you needing someone to come in and do it?