Trimming small parts

[Defiant911]

What’s try e best method of trimming small bits of sprue of tiny parts. (Inside of the two circles) I’ve managed to break these sort of parts before trying to file or trim with knife. Any other good tips please.[ATTACH]391431[/ATTACH]

[KarlW]

Fresh blade and carefully, best I can offer.
I usually position such a thing so I am carving torwards my thumb so my thumb supports it, means the odd bit of blood on the bench though.

[Guest]

I would use a round needle file and then some fine W&D to finish.

[dave]

A new scalpel blade and sandpaper glued to a small length of dowel. Also very carefully

[Defiant911]

Ok, thanks for advice. Sounds like slow and careful is the only way forward.

[Defiant911]

another issue with the model, the cockpit glass seems to be slightly under size. There’s a gap either front or back depending how it’s positioned. I suspect it would be easier to fit correctly at the front due to shape and then it’s a case of fill the gap at back which you can see in this picture. The gap is between 0.40mm & 0.85mm from one side to other. What’s the best filling option for such a situation ?

[dave]

My personal choice for a small gap in and around the glazing is PVA adhesive

[Gary MacKenzie]

I haven't built planes for a while , BUT , i would think adding a shim to the front of the ''glass' between it and body would be easier than trying to fill or make a shim for the thin back piece

[KarlW]

I would second the shimming the front, maybe some microstrip glued into place.

[stona]

Third the shimming!

I'd have to have the kit in my hands to decide where.

You might still need a bit of filling, and for that I second Dave's suggestion of PVA. I have an old and rather thick bottle for just such an eventuality. The best is that you can just wipe the excess away with a damp finger, or cotton bud.

[Defiant911]

Cheers all, the good thing is the back of the cockpit glass is painted so no fear of fogging. When you refer to shimming what do you use, a slither of plastic spruce cut to fit?

[KarlW]

Cheers all, the good thing is the back of the cockpit glass is painted so no fear of fogging. When you refer to shimming what do you use, a slither of plastic spruce cut to fit?

You can buy thin strips of plsticard which comes in useful, Evergreen Styrene in the site sponsors shop.

[minitnkr]

I use a dremel cutting wheel for plastic to remove inner sprue. This method puts no strain on the ring to be saved. Then use new #11 blade to finish. I'd prolly use thin shim or PVA at rear of canopy so as to preserve good fit elsewhere. PaulE

[Gern]

Here you go Carl:

https://www.scalemodelshop.co.uk/product/10pk-25mm-x-50mm-x-35cm-plastic-strip-evergreen-eg100

John does a range of sizes so you can measure the gap and pick the one you need. I'd fix a strip of this to the back of the clear part rather than to the aircraft body - that way you haven't got to worry about the corrugations. The guys have suggested the front of the glass but that seems more difficult as you have multiple curves to negotiate. At least at the back you're only dealing with curves in one direction.

If you fix just one straight side flush to the outside of the window frame with a small amount of extra thin and wait for it to dry - about 20 mins should be enough - you can bend the strip to match any curves and glue it in small sections. You need to be careful and hold it in place until the glue starts to harden - only a minute - then move on to the next bit. You can pre-bend the strip with your fingers to get it to the approximate shape you need before you start. Leave an overhang at each end so you don't have to worry about precisely matching the length. Once you're done, just cut them flush with the frame.

With a suitable bit of painting, the extra strip becomes part of the window frame.

[Defiant911]

Here you go Carl:

https:tongue-out3:/www.scalemodelsho...vergreen-eg100

John does a range of sizes so you can measure the gap and pick the one you need. I'd fix a strip of this to the back of the clear part rather than to the aircraft body - that way you haven't got to worry about the corrugations. The guys have suggested the front of the glass but that seems more difficult as you have multiple curves to negotiate. At least at the back you're only dealing with curves in one direction.

If you fix just one straight side flush to the outside of the window frame with a small amount of extra thin and wait for it to dry - about 20 mins should be enough - you can bend the strip to match any curves and glue it in small sections. You need to be careful and hold it in place until the glue starts to harden - only a minute - then move on to the next bit. You can pre-bend the strip with your fingers to get it to the approximate shape you need before you start. Leave an overhang at each end so you don't have to worry about precisely matching the length. Once you're done, just cut them flush with the frame.

With a suitable bit of painting, the extra strip becomes part of the window frame.

Thanks for that link and explanation Dave, I was struggling to find it in the shop. I’ve ordered some so will give this a go. Sounds useful stuff to have in the kit anyway. Carl