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| Cutting pickguards http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10106&t=47202 |
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| Author: | cbrviking [ Thu Feb 04, 2016 9:23 am ] |
| Post subject: | Cutting pickguards |
How do you guys put pickguard material? The few time I've tried it the edges just melt and ball up and it's a total mess. |
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| Author: | Kevin Waldron [ Thu Feb 04, 2016 2:11 pm ] |
| Post subject: | Re: Cutting pickguards |
O-flute bits. http://www.onsrud.com/xdoc/SuperO = one such bit. Blessings, Kevin |
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| Author: | PeteFede [ Thu Feb 04, 2016 4:31 pm ] |
| Post subject: | Re: Cutting pickguards |
ABS is a soft plastic with a low melting point. SFM for plastics generally ranges between 200 and 500 I believe SFM is lower for ABS than other plastics because of the low melting point. Your cut is likely too light. Try decreasing your spindle speed if possible and/or increase your feed rate. |
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| Author: | Bob Garrish [ Thu Feb 04, 2016 9:08 pm ] |
| Post subject: | Re: Cutting pickguards |
Take more than one pass, you'll almost always melt plastic when trying to go through in one pass unless everything is right. Taking a rough and then finish pass means you only have material on one side of the cutter on pass two, and that means a lot less chips to melt together. When I machine slots or outside profiles in acrylic, for example, I generally run the exact same pass twice and the second one clears out all the welded on chips and other fuzzies. Correct me if I'm wrong, but I think what Peter means is that your feed is too light, rather than your cut. And he is quite correct on this: you will want to use a feed that seems aggressive. Feed rate would be something like 100 IPM at 10K RPM for a 1/4" cutter, so if you have a 20K spindle then you want to be doing 200 IPM. With a smaller cutter, you still want to be cutting fast, so even for a 1/8" cutter I'd be trying to get up to 120 IPM at 20K or 60 IPM at 10K. |
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