Coarse Grinding File is a U-STAR coarse sanding stick for the first stage of cleaning up plastic parts — leveling a mold parting line and sprue remains, where what matters is fast removal rather than a final smoothness.
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A sanding stick from the U-STAR tool range, made for the coarsest stage of sanding a plastic model. The word coarse in the name marks a coarse grade of abrasive: the tool takes material off quickly and is built for leveling a shape, not for a final shine. In a workshop it therefore comes first, right after the parts have been taken off the sprue.
The most common job for a coarse sanding stick is the mold parting line. An injection mold leaves it on every part as a thin ridge — on aircraft fuselages it runs the whole length, and on barrels, struts and cylindrical parts it is obvious at first glance once the paint is on. A few strokes with a coarse abrasive take it down to the surface faster than any fine tool. It is also used to level sprue remains standing above the surface and to shape cured filler roughly on larger areas.
Sand in short strokes in one direction and keep checking the shape against the light. A coarse abrasive takes material off faster than a modeler expects, and a hollow is then considerably harder to level than the original ridge was. On curved parts press as little as possible, so that no flat facet appears. Never leave the coarse step as the last one — its marks are brought out under a gloss clear coat, so it is always followed by a finer sanding stick and finally by a sponge or paper of a higher grit.
A loose piece of abrasive paper bends under the fingers and rounds off edges that should stay sharp. A sanding stick with a firm backing holds a plane, so a surface stays flat and an edge stays an edge. That is the main reason it is worth having in a workshop alongside a set of papers.
Naši poradci a znalci sortimentu jsou připraveni odpovídat na Vaše dotazy (Po–Pá, 8–18 hod).
Zeptejte se na co potřebujete, odpovíme co nejdříve.
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