On Tuesday 16 August 2016 03:28:44 Erik Christiansen wrote: > On 15.08.16 16:36, John Thornton wrote: > > Hi Andy, > > > > Thanks for the link but it has to be very thin and slide over the > > green things. I have identified it as a Hennig product... I think > > this is the product. > > > > http://www.hennig-inc.com/products/flexible-apron-covers/aluflex/ > > > > So I'm wondering if there is a more cost effective way to replace > > that aluminum apron thing... I'm sure they are not cheap. > > As it spools onto the roller underneath, the hinging must be at or > near the top of the bars. With not a heap to lose after a failed > previous fix, is there sufficient thickness for drilling horizontally > through the bars just below the top surface, near each end, then > stringing fine critter wire? Ideal would be a tension spring at one > end of each wire, to snug the thing up in service. > > Otherwise, it would also be less labour intensive to simply laminate a > sheet of mylar film onto the top of the bars. That would provide both > the required hinge and a complete barrier to fine swarf. A very good > clean, then a tube or two of cyanoacrylate glue, might just do the > trick. People probably don't use mylar drawing film any more, but > there has to be another source of good tough plastic film out there. > > Erik > "kaptan" comes in pretty thin stock, like .001". Broadcasters probably have some as precut insulation used in hi-power tube sockets, forming bypass capacitors between two sheets of silver plated brass.
ISTR I saw it in rolls in the McMaster-Carr or Grainger catalog. Amazingly high voltage breakdown, like 20,000 volts in a sheet 3 or 4 mills thick. But I've no clue what its long term survival as a bending material might be. I've never seen it used where it had to bend. What I have handled impressed me with its physical srength in such a thin sheet. No clue how well the cyanoacrylate glue would stick to it. I'd imagine it would shrug off temps that would bake that glue loose, but I'd doubt it would ever get that hot as a swarf cover in a milling machine. It's a Dupont product since the'60's but I was not able to coax the dupont site into giving me available widths. It can come with a pressure sensitive glue on one or both sides, and is heavily used in the flexible printed circuit field. I googled for 'kaptan polyimide film, perhaps there is a better search term? <http://www.professionalplastics.com/KAPTONFILMPOLYIMIDE> shows me a 24"x24" by 5 mill sheet at $120. A bit high but I expect you could cut what you need out of that and store the rest for when, and if you had to do it again. You've not said the dimensions so I can only guess how many times. Thats w/o any glue. Call 1-888-995-7767 for a quote. Does this help, John? Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
