On 4/23/21 11:45 AM, hp-...@xs4all.nl wrote: > I think I misread you answer, 4mm tube for me is 4mm inside diameter, I > suppose you mean 4mm wall thickness. > And the inside diameter of the 9144/45 is 12mm (~.5") the outside is about > 18mm (~.7") (~3mm wall thickness). > I use polyurethane to make the new capstans, turn them on the lathe.
The inside diameter of the silicone vacuum tubing is 4mm. Grabbing my calipers, the outside diameter is about 9.5 mm, so the wall is quite thick. It takes a bit of strength to get it stretched over the metal body of the rollers--some silicone spray lubricant helps. Once there, it's not going anywhere. Since it's extruded tube, it's perfectly concentric. I stumbled on it after ordering a quantity to replace the PVC vacuum hose in my truck. After 25 years, it had turned brittle and was cracking. --Chuck
