Stripping Twisted Shielded PTFE Jacketed Wire

We are currently using the M20 Hot-Tweezer made by Meisei. It is not consistant, but uses the same process. What temp does the TWC-1 use to strip the teflon?

It's variable (TWC-1 model has variable temp) depending on setting.

We run it up to #7.

Here is an idea that should work in my opinion.

Let us say you have wire outer diameter of 2.0mm and conductor diameter of 1.0mm.

Take a square section steel rod 20 mm X 20 mm, 50 MM long and make a horizontal hole at the centre with wire cut that allow slid fit to the teflon wire diameter of 2.0mm, so now wire can rotate in hole with some external force. make a vertical slit on steel rod that is perpendicular to hole, and keep the depth of slit (20/2 - radius of conductor 0.5mm= 9.5mm) 9.5mm and width of slit should be equal of the thickness of a shaving blade or exactoknife blade.

Now if you push the wire in hole, insert blade to full depth and rotate wire. It will give you a clean cut without cut mark on strands.

With the little bit of effort this can automated.

Twisted shielded wire is NOT round. That is the problem.

#1 is the solution. I found, that all others nick wires.

But, you better have a good exhaust: poly...FLUOR ethylene. Fluor in any form is not healthy to breath.

Have you considered non- stripping techniques?

Ideal makes a hand stripper that you can change cutting blades from the common sharp knife blade to a rounded edge blade. I have used these and was amazed although teflon would leave a tail. For teflon I used the above heat stripper but didn't like it because I would burn myself or it would slide off the work bench into my lap. I would suggest getting an Ideal catalogue and check into it. (I have no connection to Ideal.) Otherwise, I would try to find out what tool is suggested for doing mil spec work. Mil spec is rather anal about nicked wires. When designing spacecraft, weight is critical and conductor gage is chosen to be the minimum necessary plus a safety factor. Strand loss and even nicked strands is not tolerated in any of the multi thousand connections.

I have had the same problem in 34 years working in aviation. Thermal strippers were the best solution for the twisted shielded jacketed pair M27500 cables that I could find until 2010. I saw a ad for a expensive handheld unit made by Sednal Technologies, their model TSK-7000A. I was able to test the TSK-7000A on M27500-24, 22 & 20 awg twisted pair cables in my shop & think it is the best solution to the twisted pair problem. The EDMO rep showed up with the unit one day & it worked with everything we tried it on. It also worked on the more round 3, 4 & 5 conductor cables. The Die selection chart shows die # TDA-24-2A for your M27500-26rc2s06 cable. There is a video on the EDMO web site. WWW.edmo.com. The URL for Sednal is www.twistedstripper.com. PS no compressed air or electrical service is needed.

Doug

Update to all who contributed. I have finally convinced our company to "Try" the Twisted Stripper. After 1 week of use we purchased the trial unit and ordered a second unit. In time studies conducted on the stripping process we found that the twisted stripper was 73% faster than thermal stripping with less stress on the conductors. We have found that there is an occasional cut of 1, (sometimes 2) strands of shielding close to the end of the wire. This shielding is trimmed off and is not used, (we uses solder sleeves and terminate shielding with a wire and contact into the connector) thereby giving us an acceptable stripping every time. The ongoing cost will be the cost of the dies every 2000 to 4000 strips.

Thanks for all of your input!!!

Try scoring the jacket part way througn with a razor knife and then bending/twisting at the cut. I have had much sucess using this tecnique.

Have you asked the cable manufacturer?