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Cleaning DTI clear plastic face

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David Murray 119/05/2017 09:14:42
6 forum posts

I have an old DTI that I want to use for a tool setting project. It is a lovely 0.0005" bit of kit but at some time somebody has cut the mounting lug off it. Anyway, the problem I have is the front see through plastic window is all cloudy. I have tried whipping it over with acetone and no improvement.

Any advice on how I could clean it up? I did wonder about a bit of T-cut?

pgk pgk19/05/2017 09:22:25
960 forum posts
278 photos

Lots of things you could try from baking soda/water to toothpastes before moving to t-cut. the good news is that if you google there's loads of places that could likely supply a replacement off the shelf and places that would make a piece to fit for not too much..

Circlip19/05/2017 10:25:50
842 forum posts

Check Solvent vapour polishing, otherwise, plastic "Glasses" are available from watch and clock spares suppliers. Some have turned their own and fitted using clear Acrylic or Polycarbonate turned slightly oversize on diameter and sprung in using a domed "Punch" and ring die.

Regards Ian

David George 119/05/2017 10:34:58
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218 forum posts
94 photos

I have used Solvol Autosol chrome polish on similar objects.It just takes a lot of time to polish out scratches, try it with a piece of felt or polishing bobbin.

David

Hopper19/05/2017 10:59:07
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2099 forum posts
26 photos

+1 on Solvol Autosol metal polish. Have used it for years on DTIs and motorbike speedo lenses (plastic not glass) etc etc and it works well.

roy entwistle19/05/2017 11:33:11
729 forum posts

Acetone I find is not a good thing to use on plastics. Solvol Autosol yes

Roy

David Murray 119/05/2017 12:56:16
6 forum posts

I had the tube of Autosol out last night but thought it might be too course. Obviously not so I will have a go later. Thanks for the tips everyone

David Murray 119/05/2017 17:33:35
6 forum posts

Posted by David Murray 1 on 19/05/2017 12:56:16:

I had the tube of Autosol out last night but thought it might be too course. Obviously not so I will have a go later. Thanks for the tips everyone

That should of course read coarse!!!

Mike Poole19/05/2017 21:00:58
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1003 forum posts
30 photos

The lenses of plastic covered headlights also respond to fine wet and dry and solvol. They say Colmans mustard made a fortune from all the mustard that was mixed and left to dry out, I think Solvol must make a fortune from all the Solvol that squirts out when you stand on the tube, it will not go back in.

Mike

Alan Vos20/05/2017 17:38:13
37 forum posts
3 photos

PEEK polish is worth a try. I have rescued a few cheap digital watches with that.

David Murray 120/05/2017 21:31:48
6 forum posts

Thanks for the advice. Had a quick go with Autosol and it is much better already. Will carry on again tomorrow

Michael-w20/05/2017 23:29:59
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1852 forum posts
48 photos
Posted by Alan Vos on 20/05/2017 17:38:13:

PEEK polish is worth a try. I have rescued a few cheap digital watches with that.

+1 Fantastic on metals too.

Michael W

Brian Oldford21/05/2017 09:25:40
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392 forum posts
4 photos
Posted by Mike Poole on 19/05/2017 21:00:58:

. . . . .They say Colmans mustard made a fortune from all the mustard that was mixed and left to dry out, I think Solvol must make a fortune from all the Solvol that squirts out when you stand on the tube, . . . . .

Mike

I've also heard it said that Reeves made a fortune from all the casting they sold for locos that were never finished.

Edited By Brian Oldford on 21/05/2017 09:26:16

Neil Wyatt21/05/2017 10:49:56
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11886 forum posts
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Posted by Brian Oldford on 21/05/2017 09:25:40:
Posted by Mike Poole on 19/05/2017 21:00:58:

. . . . .They say Colmans mustard made a fortune from all the mustard that was mixed and left to dry out, I think Solvol must make a fortune from all the Solvol that squirts out when you stand on the tube, . . . . .

Mike

I've also heard it said that Reeves made a fortune from all the casting they sold for locos that were never finished.

Edited By Brian Oldford on 21/05/2017 09:26:16

Pales into insignificance against the Quorn Horde!

mechman4822/05/2017 09:18:40
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1689 forum posts
294 photos

I have used toothpaste followed up with Brasso liquid / wadding in the past when polishing plastic.

George.

JasonB22/05/2017 09:24:37
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Moderator
11694 forum posts
1040 photos

Micro-mesh works for me. Though if it is an old plastic lense the discolouration may be in the material itself not just on the surface so you could be polishing for ever.

ChrisH22/05/2017 10:25:53
673 forum posts
7 photos

You could also try Brasso

not done it yet22/05/2017 10:45:58
1269 forum posts
9 photos

Think here jet fighter canopies? They get scratched; they are repaired by polishing with different grades of suitable abrasive paste - finer and finer until the pilot can see through clearly. Likely some vids on Utoob? No different than polishing glass lenses. Only here it is often more cost effective to replace with a new item.

One can only renovate the surface. If cloudy all the way through, no amount of polishing will resolve the issue!

Michael-w22/05/2017 10:53:36
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1852 forum posts
48 photos
Posted by not done it yet on 22/05/2017 10:45:58:

Think here jet fighter canopies? They get scratched; they are repaired by polishing with different grades of suitable abrasive paste - finer and finer until the pilot can see through clearly. Likely some vids on Utoob? No different than polishing glass lenses. Only here it is often more cost effective to replace with a new item.

They are made using a very specialized type of material, it's designed to suffer as little expansion/contraction as possible under temperature extremes.

Michael W

not done it yet22/05/2017 11:49:45
1269 forum posts
9 photos

 

They are made using a very specialized type of material, it's designed to suffer as little expansion/contraction as possible under temperature extremes.

Your point is? Or was that just a passing 'aside'smiley Makes no difference to the method of scratch removal. Needing to remove the scratches, not polish them, may be important.

Cloudiness may have a different connotation.

 

 

 

From the net:

Today, the canopy is a multi-layer structure. In case of the F-16, it consists of three layers:

 

The innermost layer is 0.5 inch thick polycarbonate and drape-molded into the compound curvature shape.The center layer is 0.05 inch polyurethane to bond the inner to the outer layer.The outer layer is a 0.125 inch layer of acrylic (PMMA).

 

So not really any different on the surface, which is where it will get scratched/abraded? Poly methyl methacrylate - perspex to many.

 

 

Edited By not done it yet on 22/05/2017 11:51:34

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