5mm tube difference, does it need to be clamped down?


I bought a laser tube replacement:

problem is my new tube diameter is 55mm while the old tube (now that I measured it) is 50mm - didn’t know they sold different diameters as I didn’t have a choice when buying.

Now that I got it, it won’t fit in the old clamps, can I hold it down with zip ties or something? Does it really need to be clamped down?

Advise and help needed please!

Yes! It must be clamped down and then aligned with the mirrors. On my machine, there were 2 layers of padding between the mount and tube. I was able to remove one layer and still be able to safely clamp the new, larger tube in place. If that is not possible in your case, you can find patterns and files for new mounts on the various laser group pages.

Thanks, will see if mine has two layers as well, if not will come back search for the mounts you mentioned :slight_smile:

I wonder - what’s the overall length of your old tube in comparison to the the new one?..

Be extremely(!) careful - you can easily crack your tube if you force it into a 50mm bracket. you must pad it or use a dedicated 55mm one instead, and it goes without saying that you will need to tilt / lower it to not only hit mirror #1 dead center but also to be parallel to all the rest as possible.

850mm both

I was heading there when I thankfully held back and got the measuring thingy :confounded:

Thanks for pointing this out for all of us so we should not trust these published co2 tube comparison tables such as this one

I suppose it depends a great deal on the manufacturer and model. Some 40-50 watt tubes with a 850 mm length are 80mm diameter.

If you knew someone with a working laser you could cut some new mounts out of acrylic.

Do you have a 3D printer?

Print your own


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