I was googling about the subject but see only old posts and no real definitive solutions.
As the topic name suggests, I have a need to replace the teflon sheet under the HLV-H carriage, the dovetail piece looks ok, but the top is scored and around 30% of it has delaminated already and the rest looks like it wants to come off, I see some corrosion of the steel under delaminated portions, so I want to replace the whole thing.
I measured the sheet to be aprox. 0,3mm (0.01"), and the sheets themselves seem to be quite cheap, but then there is the question of gluing it to the steel, I see that there is a Permabond TA4610 (datasheet) adhesive that supposedly can adhere to PTFE, and there is even adhesive backed sheet available (waiting to get info about the adhesive from the seller).
Has anyone here done this with sheets this thin and is willing to share details? With the Permabond the plan was to do few test runs, spread it out using a fine comb working in one direction (miniature version of the sort masons use when they lay tile), do few tests to see how big the comb notches need to be to achieve near 100% glue contact with PTFE yet keep glue thickness to minimum.
I know about the Turcite and Rulon, but those are thicker, and I don't want to do any machining on the carriage, that would be the last resort if the 0.01" PTFE won't stick.
Before anyone asks, the dovetail itself is also quite scored, but I know of no grinding shops in 1000km radius that I would trust regrinding it, so for now it will stay as it is, the wear in the middle is minimal (when measured with mic, to the peaks of score marks), only 0.015mm dip (0.0006"), so the new teflon sheet would work as a temporary measure to get the machine operational and prevent more damage (it will see light use, no production, and no real precision required of it either, for now at least).
As the topic name suggests, I have a need to replace the teflon sheet under the HLV-H carriage, the dovetail piece looks ok, but the top is scored and around 30% of it has delaminated already and the rest looks like it wants to come off, I see some corrosion of the steel under delaminated portions, so I want to replace the whole thing.
I measured the sheet to be aprox. 0,3mm (0.01"), and the sheets themselves seem to be quite cheap, but then there is the question of gluing it to the steel, I see that there is a Permabond TA4610 (datasheet) adhesive that supposedly can adhere to PTFE, and there is even adhesive backed sheet available (waiting to get info about the adhesive from the seller).
Has anyone here done this with sheets this thin and is willing to share details? With the Permabond the plan was to do few test runs, spread it out using a fine comb working in one direction (miniature version of the sort masons use when they lay tile), do few tests to see how big the comb notches need to be to achieve near 100% glue contact with PTFE yet keep glue thickness to minimum.
I know about the Turcite and Rulon, but those are thicker, and I don't want to do any machining on the carriage, that would be the last resort if the 0.01" PTFE won't stick.
Before anyone asks, the dovetail itself is also quite scored, but I know of no grinding shops in 1000km radius that I would trust regrinding it, so for now it will stay as it is, the wear in the middle is minimal (when measured with mic, to the peaks of score marks), only 0.015mm dip (0.0006"), so the new teflon sheet would work as a temporary measure to get the machine operational and prevent more damage (it will see light use, no production, and no real precision required of it either, for now at least).