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New from Old / Re: Rebirth of a Denford MIRAC CNC Lathe
« Last post by awemawson on Today at 06:24:06 AM »
I did a pre-emptive strike on the rams and had them gathered before they knew what was happening, so could get on replacing the window rubber.

It went pretty well - no issue taking out the previous bit, and the usual struggle and acrobatics to get the new in but persistence won in the end  :ddb:

Now at least there is only one joint at the top and it's slightly neater than before (not difficult!)

I did a simple bond test between a polycarbonate off cut and a sample of Zintec that had been painted with the chassis paint I'm using.

I used the vinegar smelling version of silicone bath sealant ('acetoxy') and let it set for 12 hours - probably not long enough as it still smelt vinegary this morning - I suspect due to the very small air exposure channel.

It worked pretty well - If I still needed to bond the window in the lathe I'd be happy to use it, but I've managed to glaze the door using conventional rubber moulding strip.

I did however do a pretty aggressive peel test as per second picture. The bond area is 30 x 80 mm and the lead weight is 3500 grams. It stood the test for a good 25 minutes

This "Acetoxy" type of sanitary sealant was what I had to hand, but reading up on it is is not the best for bonding polycarbonate, however in this application I think that it would have been fine.
Polycarbonate does not react well on warming. It becomes soft but does not really melt to polish up. Try with a crap piece before charring the item itself.
The Water Cooler / Re: RIP Peter Forbes
« Last post by Brass_Machine on March 16, 2018, 10:55:15 PM »
Not familiar with Peter Forbes... But it is sad when we lose someone from any aspect of this hobby.


Introductions / Re: Hi from southern tip of Cotswolds, UK.
« Last post by mexican jon on March 16, 2018, 09:21:08 PM »
Welcome aboard Simon  :wave: :wave:
The Water Cooler / Re: RIP Peter Forbes
« Last post by mexican jon on March 16, 2018, 07:22:10 PM »
RIP Peter Forbes  :(
New from Old / Re: Rebirth of a Denford MIRAC CNC Lathe
« Last post by awemawson on March 16, 2018, 07:00:43 PM »
Well Tom I already have the replacement rubber, so hope to fit it tomorrow morning (assuming the gathering of the rams goes to plan)

It was a relief to actually get it in - I've done similar sized tractor cab windows before, but with standard factory sized glass and rubber seal.
The Water Cooler / RIP Peter Forbes
« Last post by awemawson on March 16, 2018, 06:55:35 PM »
Very sadly I have to report the loss of Peter Forbes.

Peter was very active 15 or so years ago on the newsgroup before the internet had developed as it is now. There were several of us who habitually lived there as one of the few places for sensible discussion.

We've lost from that group of people John Stevenson, Mark McGrath, Tim Leech and now Peter Forbes.

Peter was an expert on Lister Diesels, and ran the Old Engine forum. I last met him totally by chance when I was researching my Traub lathe - I'd tracked down a factory in the midlands where there were several, arranged to have a day with the owner, only to find Peter occupied the next door factory and was his tenant!

A very generous and helpful fellow who will be much missed, my condolences to his family and friends.

...heck ....there aren't many of us left from the group . . . .
Project Logs / Re: cleaning of a clock face
« Last post by NormanV on March 16, 2018, 06:42:23 PM »
Well it definitely works!
Apparently there is a manufactured version of spit that they use in museums, on large jobs their mouths get dry.
Project Logs / cleaning of a clock face
« Last post by krv3000 on March 16, 2018, 06:21:22 PM »
hi all sos not posted in a wile not bin up to much any way john has bin given a 12 inch presser gage   witch is going to be cum a clock but the face of the gage needed my loving touch  No its not going to have numbers 1 to 12 put on it  just the original numbers sorted out and the face cleaned and as to  watt I use well if you don't believe me you can google it all I use is me own spit people ho  clean  and restore works of art have bin using this method for  ages so if its good inuf  for the monas a lesa  then its ok on a clock dial the mane cleaning is dun just to touch up sum chips  right pics   
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