Page 1 of 2 12 LastLast
  1. #1
    Albeit only momentarily, I made a new spindle mount to set my machine up for 5-axis:

    Click image for larger version. 

Name:	DSC09023 (Large).JPG 
Views:	12407 
Size:	211.0 KB 
ID:	4962
    Click image for larger version. 

Name:	DSC09027 (Large).JPG 
Views:	3421 
Size:	292.1 KB 
ID:	4963
    Click image for larger version. 

Name:	DSC09026 (Large).JPG 
Views:	1885 
Size:	179.7 KB 
ID:	4964
    Click image for larger version. 

Name:	DSC09029 (Large).JPG 
Views:	9293 
Size:	272.2 KB 
ID:	4965

    But I cant think of anything to make with it :lol:

    Clearly I need to drop the bed down (which is fine, it's adjustible) to get enough clearance.
    I can also mount both rotary tables and the spindle on the Z-axis to get the spindle rotating in XYZBC configuration. May need some reinforcement. The reason I made my Z-axis have 400mm of travel is to allow sufficient clearance for future 5-axis machining with that set-up.

    Unfortunately there's quite a lot of backlash in the rotary tables, which is difficult to eliminate, so it's probably only going to be useful for woods and plastics. Ideally I should make a BC mount for the spindle using harmonic drives (too expensive), or double worm wheels preloaded (generally annoying), or timing belts (struggling to find info on how much they will stretch). But is it really worth it?

  2. #2
    around ball in a square block??

    a bust of Santa

    a set of wind turbine blades ??

    the list goes on

    James

  3. Quote Originally Posted by Jonathan View Post
    Albeit only momentarily, I made a new spindle mount to set my machine up for 5-axis:
    Quote Originally Posted by Jonathan View Post

    But I cant think of anything to make with it :lol:
    :rofl::rofl::rofl::rofl::rofl::rofl: good one Jonathan

    Quite recently I've made one wind turbine blade (580x120mm)
    Click image for larger version. 

Name:	P1190479.JPG 
Views:	574 
Size:	281.2 KB 
ID:	4966
    Rough with end mill + finish with ball-end
    I think it could be faster with 4th or 5th axis when I could do finish cut with an end mill


  4. #4
    Ahh nice one!
    Perhaps the photo is deceiving me, but it looks like you have set the airfoil at the same angle along the whole length of the blade? It should be twisted ... look at the oncoming wind and the speed of each point, radially, on the blade as vectors and the angle between those vectors plus the angle of attack is the angle you set each cross section at. I also offsetted the leading edge to obtain a taper, so the chord at the end of the blade is centered about the root. This was my first attempt before I made the CNC router, so done on the mill in 4 operations, plywood:

    Click image for larger version. 

Name:	5_small.jpg 
Views:	526 
Size:	62.1 KB 
ID:	4967

    Click image for larger version. 

Name:	1_small.jpg 
Views:	1187 
Size:	108.0 KB 
ID:	4968

    Click image for larger version. 

Name:	3_small.jpg 
Views:	896 
Size:	107.5 KB 
ID:	4969

    Then I did an MDF mould about the same length as yours and made them with fiberglass...which you've already seen. It's so much better, try it!

    http://www.mycncuk.com/forums/showth...turbine-blades

    1.5m blades coming soon...

    4 axis would make it faster as you could use the side or, with 5 axis, the end of an endmill for the finishing pass. But I'm not sure it's really worth it? Would look good though!
    Since I'm going to make moulds for the blades, not the actual blade, the surface is concave so I would still have to use a ball-nose cutter. 4/5 axis allows the cutter to be kept at a constant angle to the surface, which should allow it to cut faster as it avoids using the centre of the ball nose cutter.

  5. Quote Originally Posted by Jonathan View Post
    Ahh nice one!
    Perhaps the photo is deceiving me, but it looks like you have set the airfoil at the same angle along the whole length of the blade? It should be twisted ...
    It's barely visible, but it is twisted. Some time ago I was messing with 3d software and first thing that came to my mind was to make wind turbine blade. I left memory stick in a workshop with file, but as far as I remember there is 5 degr angle at the tip and 10degr at the root. Blade was designed to fit 120x45mm 650mm long leftover timber from Wickes I had.
    I may someday consider to make the proper ones and raise some wind turbine:whistling:,but those damn stupid permissions- can spoil whole fun of hobby engineering:sad:.
    I'd like to make them fiberglass ones, but wooden ones sanded, dyed and high gloss lacquered- pure beauty- I could keep then in livingroom and enjoy their stunning look

  6. #6
    Would this rotary table be any good ??

    http://www.axminster.co.uk/axminster...ble-prod22377/

    or should I go smaller ??

    James

  7. Quote Originally Posted by luke11cnc View Post
    Would this rotary table be any good ??
    http://www.axminster.co.uk/axminster...ble-prod22377/
    James
    Difficult to say until you try
    I have HV6 from WARCO and it looks like for me Jonathan have the same one :), /or all them can be generic ones with different names. Anyway I don't complain about mine so far. I just come back from the garage after exercising dividing plates, (46 tooth timing pulleys- 1 full turn and 22 holes@23 holes dividing plate, enough to make my hand sore :whistling:

  8. #8
    Quote Originally Posted by wiatroda View Post
    Difficult to say until you try
    I have HV6 from WARCO and it looks like for me Jonathan have the same one :), /or all them can be generic ones with different names.
    The Axminster one looks exactly like the one Chip got with a different label. The giveaway is it seems the vertex ones have thin fine lines for the markings and a bigger dial with vernier scale whereas the others have thicker more wobbly lines...the HV6 on the warco site (http://www.warco.co.uk/rotary--compo...ry-tables.html) says SOBA on it, and also has 4 slots whereas the vast majority of vertex have 3 slots.
    Whether it matters or not depends on what you're using it for.

    Quote Originally Posted by wiatroda View Post
    Anyway I don't complain about mine so far. I just come back from the garage after exercising dividing plates, (46 tooth timing pulleys- 1 full turn and 22 holes@23 holes dividing plate, enough to make my hand sore :whistling:
    That's why I almost immediately after getting mine put a stepper motor on it. Gets tedious fast doing pulleys manually. I did one 16T that way...

    http://www.youtube.com/user/Jonbliss.../8/lVuBEEceWJ4

  9. Quote Originally Posted by Jonathan View Post
    That's why I, almost immediately after getting mine, put a stepper motor on it. Gets tedious fast doing pulleys manually. I did one 16T that way...
    Agree, stepper would greatly ease and speed up a job.
    It's not cranking itself , but pulling back handle to unlock is painful as the spring is really strong- too strong.
    My rotary has 4 slots and fits nicely to four mounting holes in a chuck
    How about programming rotary table- looks like hand written G-code for me.
    What about making some macro with some loop working until machine cut desired amount of tooth???? some no. of tooth variable in a macro??

  10. #10
    Have you decided what your going to make with your 5-axis yet Jonathan

    James and Luke

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 12
    Last Post: 25-05-2013, 12:41 AM
  2. RFQ: Z axis and y axis carriage
    By D-man in forum Projects, Jobs & Requests
    Replies: 0
    Last Post: 08-04-2013, 10:06 AM
  3. NEW MEMBER: Goal - Enable 3-Axis CNC Bed Mill to Perform 5-Axis Milling
    By LoveLearn in forum New Member Introductions
    Replies: 2
    Last Post: 25-01-2012, 08:46 PM
  4. Y axis is making X axis stall...!!
    By fasteddy in forum Machine Discussion
    Replies: 83
    Last Post: 24-10-2011, 12:19 PM
  5. Precision metal processing (3 axis, 5 axis, 7 axis) OEM
    By 7AxisCNC in forum Manufacturer News
    Replies: 0
    Last Post: 17-05-2011, 02:04 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •