98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2013-2016 Florian Festi
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from boxes import *
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class LaserClamp(Boxes):
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"""A clamp to hold down material to a knife table"""
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description = """You need a tension spring of the proper length to make the clamp work.
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Increace extraheight to get more space for the spring and to make the
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sliding mechanism less likely to bind. You may need to add some wax on the
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parts sliding on each other to reduce friction.
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"""
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ui_group = "Misc"
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def __init__(self):
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Boxes.__init__(self)
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self.addSettingsArgs(edges.FingerJointSettings, surroundingspaces=0)
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self.argparser.add_argument(
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"--minheight", action="store", type=float, default=25.,
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help="minimal clamping height in mm")
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self.argparser.add_argument(
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"--maxheight", action="store", type=float, default=50.,
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help="maximal clamping height in mm")
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self.argparser.add_argument(
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"--extraheight", action="store", type=float, default=0.,
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help="extra height to make operation smoother in mm")
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def topPart(self, l, move=None):
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t = self. thickness
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tw, th = 12*t, l+4*t
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if self.move(tw, th, move, True):
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return
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self.moveTo(8*t, 0)
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self.rectangularHole(t, 2*t+l/2, 1.05*t, l)
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self.polyline(2*t, (90, t), l+1.5*t, (-90, 0.5*t),
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2*t, -90, 0, (180, 0.5*t), 0,
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(90, 1.5*t), 9*t,
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(180, 4*t), 2*t, (-90, t))
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self.hole(-5*t, -3*t, 2.5*t)
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self.polyline(l-5.5*t, (90, t))
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self.move(tw, th, move)
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def bottomPart(self, h_min, h_extra, move=None):
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t = self. thickness
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tw, th = 14*t, h_min+4*t
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if self.move(tw, th, move, True):
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return
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ls = t/2*(2**.5)
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self.moveTo(2*t, 0)
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self.fingerHolesAt(3*t, 2*t, h_min+h_extra, 90)
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if h_extra:
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self.polyline(4*t, (90,t), h_extra-2*t, (-90, t))
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else:
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self.polyline(6*t)
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self.polyline(4*t, (90, 2*t), 3*t, 135, 2*ls, 45, 1*t, -90, 6*t, -90)
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self.polyline(h_min, (90, t), 2*t, (90, t),
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h_min+h_extra-0*t, (-90, t), t, (180, t),
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0, 90, 0, (-180, 0.5*t), 0 , 90)
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self.move(tw, th, move)
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def render(self):
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t = self. thickness
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h_max, h_min, h_extra = self.maxheight, self.minheight,self.extraheight
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if h_extra and h_extra < 2*t:
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h_extra = 2*t
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self.topPart(h_max+h_extra, move="right")
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self.bottomPart(h_min, h_extra, move="right")
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self.roundedPlate(4*t, h_min+h_extra+4*t, edge="e", r=t,
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extend_corners=False, move="right",
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callback=[lambda: self.fingerHolesAt(1*t, 2*t, h_min+h_extra)])
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self.rectangularWall(1.1*t, h_min+h_extra, "efef")
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