#91
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Sounds weird, but looks like i got bad set of bits. Yesterday arrived second shipment and i cutted with one bit 6 sheets of alu. That is 12 hours cutting.
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#92
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And final truth of cutting alu 5754 sheets is totally different as discussed before... I moved from 4mm bits to 5mm bits because they are stronger and dont broke so easy and give better results.
Final cutting data: 5mm one flute endmill (20 degrees spiral angle) Spindle 20000 rpm Ramping plunge (10 deg ramp angle 10mm ramp lenght) feedrate 1500mm/min Cutting feedrate 2000mm/min I was cutting 4mm sheets and cutting depht inside contures 2mm per pass and outside contures 1,33 mm per pass. Outside i was cutting less with one pass because sheets arent always ideally straight and if cutter takes more than 2mm it goes to resonance and it may broke. Some pictures too: |
#93
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Expertly done.
Looks like racing car seat backs.....nice! |
#94
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Nicely done. How many bits did you end up going through. Are they going to be bent. The reason I ask is the grain direction looks different across the different pieces.
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#95
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They arent rally car seat backs. they are ATV skid plates. I make cutting job and then they gonna be bent and welded.
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#96
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Some pictures of one job. Wind turbine blades, 2,8 meters long. Workpiece was 120*400*3000 mm. Cutting time for one blade about 16 hours.
Pictures: |
#97
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exceptional use of the MM. Bravo.
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#98
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Sweet !!! Have I mentioned how awesome MechMates and their owners are ?? !!! I am loving all these great projects I am seeing everyone working on.
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#99
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???
Is that blade made from a single block of lumber or is it laminated. You can't find lumber that is that nice for a good price here in the states. |
#100
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Its laminated spruce. Price here is about 100€ per piece. Many are already asked for sharing blade file. I post it here. Profile is NACA 4419
Last edited by ifffff; Fri 26 August 2011 at 06:47.. |
#101
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Those blades look like they can be quite heavy?
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#102
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No they arent so heavy. One blade weight is about 15-20 kg.
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#103
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Havent posted here for long time. I decided to build second mechmate. This time all steel tubes. Work area same as first one 3400x2100
For now steel is here. 1471936795086.jpg 2016-08-23 16.42.56.jpg |
#104
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Good luck with the second build Ivo.
Do you have that turbine blade in STL format. I tried some online conversions but I keep getting a empty file message. |
#105
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I have .igs file. Stl seems to be already deleted. If that format is ok give me your e-mail address.
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#106
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I downloaded the .igs file from your earlier post.
That is the one I tried to convert to .stl online. Thank you for your reply. Have a good weekend. Last edited by lonestaral; Fri 26 August 2016 at 06:54.. Reason: Weekend wish |
#107
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Here is stl file. tiivik.rar
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#108
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Thank you very much.
It worked. I will build one to scale some day |
#109
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Its taking shape. Has someone good idea how should i turn this beast on feet? If i gonna weld base table all togehter i weights about 900kg.
Some pictures too: 2016-09-06 13.17.27.jpg 2016-09-06 19.08.52.jpg 2016-09-08 10.44.35.jpg |
#110
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Good luck with second build Ivo.
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#111
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Its now on feet, with help of telescopic loader. For cross bearers i added one rectangular tube to support center. With 115kg load ( i standed on it) bends cross bearer 0,08mm. On my first mechmate i havent measured bending, but it is visible if i stand on table.
2016-09-09 16.27.19.jpg |
#112
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Nice and beefy ;-) good to see some activity here.
Why did you make your triangulation short as in with straight pieces in between ? You loose a little of the effect yoir are after that way. Also since you are all welded, other way round would mean even more stiff tabletop. |
#113
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Making triangulation is limited by bandsaw sawing edge. But i think its strong enough like this. Diagonals and lower cross braces are made from 80*60*4 rectangular tube, cross bearers 120*60*5 tube. By adding 5x more steel i think table is almost unbendable, but this is already story of third build.
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#114
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More about rigidity. Main beams are 200*100*8 tube, end plates not welded yet. I fixed indicator on cross bearer and its needle to upper edge on main beam. Flex with twisting it with hands are 0,02mm. #38 main beams are made from 200*75 C channels and i can twist them about 1,5mm!!!!!!
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#115
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To achieve better accuracy i gonna use hiwin HGR20 linear guideways. To get linear slides better fixed and keep them on their place i made from 12*80 steel bar linear slide bases. Of course i milled them out with mechmate.
Milling with endmill tip is good endmill killer. 2016-09-14 13.16.52.jpg For saving bits as cutting 2,5*20 stripe on steel bar i drilled some holes. 2016-09-16 13.58.47.jpg Steel bars were quite warped too, so lets cut them straight. 2016-09-15 14.36.58.jpg 2016-09-14 16.59.43.jpg Milling steel bar On video i am cutting steel bar straight with endmill side. Spindle 10000rpm, feedrate 480mm/min, stepover 0,6mm. Endmill is TaeguTec TSE 2060M UF10 |
#116
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That's cool ! Interested to see the linears, I have same laying around, but never mounted them yet still using MM v rails.
Last edited by Fox; Mon 19 September 2016 at 01:21.. |
#117
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To make main beams straight i am levelling them with epoxy.
Dams made from melamine board and coated with mold release wax are in place: 2016-09-19 18.10.19.jpg To seal it correctly i poured first on corners one layer fast curing epoxy: 2016-09-19 18.10.31.jpg |
#118
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Meanwhile when epoxy is curing i have lots of holes to thread. For rails about 230 pieces.
2016-09-21 11.45.09.jpg |
#119
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#120
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Here are some updates about buildlog over looong time.
Linear rail straightness is checked with steel wire. Hanging weight on one side is about 35kg 2017-07-14 17.39.32.jpg 2017-07-14 17.39.49.jpg 2017-07-14 18.06.32.jpg Linear rail block mounts milled 2017-07-31 11.24.44.jpg To make it more stiffer as original Mechmate, gantry tubes are 120*60*5 2017-07-31 11.39.38.jpg 2017-07-31 17.49.09.jpg 2017-07-31 17.49.19.jpg |
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