. .
Page 13 of 23 FirstFirst ... 31112131415 ... LastLast
  1. #121


    Like that...but hopefully with better welding...
    Last edited by njhussey; 23-07-2014 at 01:11 PM.
    Neil...

    Build log...here

  2. #122
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  3. #123
    New photos of the progress
    Yesterday i cut the steel and the aluminum pieces for the bed
    Click image for larger version. 

Name:	IMG_3220.jpg 
Views:	317 
Size:	230.7 KB 
ID:	12879

    I install a winch at the roof , as the weight of the table is big ( nearly 140 kgr so far) to handle with my hands
    I turn the table upside down to full weld all the joints
    Click image for larger version. 

Name:	IMG_3221.jpg 
Views:	339 
Size:	163.4 KB 
ID:	12880

    I remove the middle piece as i change my plans. Another three pieces will be welded vertical to the sides of the machine

    Click image for larger version. 

Name:	IMG_3227.jpg 
Views:	332 
Size:	299.3 KB 
ID:	12881

    I put temporary the steel and aluminum pieces of the bed to get an idea how the machine will looklike
    Solid works is very good but the real world even better.

    Click image for larger version. 

Name:	IMG_3229.jpg 
Views:	382 
Size:	333.4 KB 
ID:	12882Click image for larger version. 

Name:	IMG_3230.jpg 
Views:	412 
Size:	278.9 KB 
ID:	12883

    I will use epoxy for the rails level but i try to be as precise as possible.
    I chek the level of the table and the results are very good
    I use two diagonal threads that they just touching each other ( that means the orners are at the same level)
    Also i use a digital level that shows RELATIVE ANGLE between the diagonals 0.0o.

    If you see the videoa the absolute angle is 2.0-2.1. That is not a real mesurement as the level fall from my wifes hands and has an offset 2.0o. That is not matter as what maters is the relative angle
    Here are the videos



    Last edited by ba99297; 24-07-2014 at 03:44 PM.
    The creative adult, is the child who survived

  4. #124
    Coming along nice Vagelis. Don't waste too much time on trying to level just yet until your ready to do the epoxy leveling. Removing twist is important and it looks like you are doing a good job here.

    I would put some more supports under the Bed. Even thou your using steel it will resonate if it's not supported in the middle. I would put 2 more pieces in there.
    Also like as been said braces in corners to help keep square won't hurt.

    Much nicer feeling building than designing isn't it. . .Lol

  5. #125
    Thanks for the comments.
    Even so far everything is ok i had some issues wtih the gantry and i want your opinion

    I plan to build the gantry with 2 pieces 120X60X4mm and 2 pieces 80X80X4mm so i would make sometring like that

    Plan A
    Click image for larger version. 

Name:	Εικόνα1037.jpg 
Views:	337 
Size:	951.0 KB 
ID:	12885 Click image for larger version. 

Name:	Εικόνα1038.jpg 
Views:	313 
Size:	949.8 KB 
ID:	12886

    but i realize that the 120X60 tube is 3mm and not 4mm as i thought. So i think that i may have resonance issues.
    TO be more specific at the front of the gantry 10mm steel plate will be welded so finally it will become like this

    Click image for larger version. 

Name:	total.JPG 
Views:	372 
Size:	278.8 KB 
ID:	12887

    Plan B
    With 2 pieces of 120X60X3mm tube at the top and the bottom and 4 spacers 120X60X3mm 160mm long
    Click image for larger version. 

Name:	Εικόνα1039.jpg 
Views:	347 
Size:	958.9 KB 
ID:	12888Click image for larger version. 

Name:	Εικόνα1040.jpg 
Views:	352 
Size:	917.0 KB 
ID:	12889


    Plan C
    Two 80X80x4mm tubes at the top and bottom and a 120X60X3mm at the middle. May move the 120X60 tube 2cm to the back so to have room for the balnut flange

    Click image for larger version. 

Name:	Εικόνα1041.jpg 
Views:	319 
Size:	949.3 KB 
ID:	12890 Click image for larger version. 

Name:	Εικόνα1042.jpg 
Views:	319 
Size:	199.6 KB 
ID:	12891



    All thre plans will have the front 10mm steel plate as shown at plan A
    All three palns have 280mm gantry height

    Plan D
    Three 80X80X4mm tubes with the middle tube offset by 4cm to leave room for the ballnut. This will reduce the gantry height to 240mm and i dont know if it will weaken the machine.

    So my questions are
    1. which of the above plans would be better?
    2. Assuming i will put the rails at the front do you think i can reduce the gantry height ( according to my plans it should be 280mm and nearly this should be the distance between the out face of the carriages of y axis). Plan D reduces the gantry height to 240mm. Remember that the length of the gantry is 1160mm.


    Thanks for you time

    Vagelis
    Last edited by ba99297; 24-07-2014 at 11:01 PM.
    The creative adult, is the child who survived

  6. #126
    Dont be in a rush with it. better think it again. from various angles.


    Now a couple of questions which are related:

    -Why the 280mm height? Did you purchase already the rails for the Z at certain length?
    -what is the width of the Z carriage plate that slides on the gantry?

    Because i believe that it can be made narrower and that bearings with some thought to go behind the Z, not to eat of your Z travel left right/x axis/.

    -what about the total weight of the gantry? you are not going with servos, right? this frontal plate will weight a lot. Actually i don't like it for that reason. You can strengthen the gantry in other ways. For example plan B and fit triangles inside where the vertical pieces are and no face plate. If the vertical pieces are spaced ~30cm or less there will be no need at all for face plate.


    I was personally for plan B, but... Check again all the details, may be a mix of them all. Cause now looking at my drawings in fact i see B impossible as you draw it, cause you only need 40mm of the ball screw support to go inside so the ball screw housing barely shows, but in that case the rails should go inside the profile, which is impossible. So may be draw it first. To me it seems that C is closest of all to the measures . Just move back the middle piece so its 43mm back from the front.
    You can reinforce it like this/ the middle profile in your case/ :


    Click image for larger version. 

Name:	CNC.jpg 
Views:	413 
Size:	379.3 KB 
ID:	12892


    I cant remember if you have already bought the ball screws and the rails, if not-fit that motor inside as i told you at the beginning :-) and save some money for beer :-)

  7. #127
    Sylyavski i answer your questions to make things clear

    The 280mm height is the result of the conevrsations that i had at this thread. They advice me to have minimum distance betwen the outer face of the carriages 250mm. So i make combinations wtih 120X60 and 80X80 tubes to get that height. So two tubes 120X60 at the top and bottom and two 80X80 give me the 280mm

    The width of the z axis carriage plate is 370mm. Even if i narrow it as you suggested, i wont get more y axis travel as the spindle plate will conflict with the bottom steel plate ( where x axis carriages will be bolted.

    The total weight of the gantry so far is nearly 140 kgr
    I will use servos. 4 yaskawa sgmph 400 watt each ( two of them for x axis). 2010 ballscrews for x and y axis, 1605 for Z. 2:1 geat ratio for all axis ( 2 at the ballscrew 1 at the motor. Htd 15 with 5mm pitch aluminum pulleys.

    Rails carriages, ballscrews, motors and spindle (2,2 kw) are in my hands. So no change can be made at these components.
    If there is any suggestion i will be glad to hear

    Vagelis
    Last edited by ba99297; 25-07-2014 at 04:25 PM.
    The creative adult, is the child who survived

  8. #128
    I get it now. Then maybe you could look at my last post in my next build and consider how I am making my gantry http://www.mycncuk.com/threads/6619-...0346#post60346
    May be you would like some of mine ideas which i belive will lead to very strong gantry with no overhang and exclusively made from profiles, like the ones you have. That's the best I have come till now.

  9. #129
    Here is my progress the last two days.
    Yesterday all the day pass drilling and taping the bed and the table for attaching the bed
    Attachment 12913
    Attachment 12914
    Click image for larger version. 

Name:	IMG_3262.jpg 
Views:	311 
Size:	236.2 KB 
ID:	12915Click image for larger version. 

Name:	IMG_3263.jpg 
Views:	322 
Size:	264.7 KB 
ID:	12916
    Click image for larger version. 

Name:	IMG_3264.jpg 
Views:	324 
Size:	285.2 KB 
ID:	12917

    And that is how i end up today
    Click image for larger version. 

Name:	IMG_3278.jpg 
Views:	318 
Size:	285.9 KB 
ID:	12918


    No time to write. It is too late... Sorry
    Tomorrow

    Thanks


    Vagelis
    Last edited by ba99297; 28-07-2014 at 12:23 AM.
    The creative adult, is the child who survived

  10. #130
    Today progress
    I have to weld the upper 80X80 pieces ( where the rails will rest )
    The lower pieces ( over the foots) make i little curve ( nearly 5-6mm ) at the middle as reult of the heating.
    So i decided to weld 4 spacers at the corners. Put the upper pieces with spot welding after make everything square and parallel as possible
    Here we are
    Four spacers 120mm at the corners
    Click image for larger version. 

Name:	IMG_20140803_123130.jpg 
Views:	327 
Size:	516.3 KB 
ID:	12957 Click image for larger version. 

Name:	IMG_20140803_123154.jpg 
Views:	291 
Size:	383.0 KB 
ID:	12958

    Then i put the upper pieces and before i spot weld i try to make everything square. I use the 1160mm pieces (this is th excact distanse that the upper 80X80 pieces should have) that i will use for the gantry, and other parts of the cutting bed to make everything parallel

    Click image for larger version. 

Name:	IMG_20140803_140323.jpg 
Views:	303 
Size:	269.7 KB 
ID:	12959 Click image for larger version. 

Name:	IMG_20140803_140330.jpg 
Views:	290 
Size:	190.4 KB 
ID:	12960Click image for larger version. 

Name:	IMG_20140803_140337.jpg 
Views:	274 
Size:	381.6 KB 
ID:	12961 Click image for larger version. 

Name:	IMG_20140803_140350.jpg 
Views:	293 
Size:	326.8 KB 
ID:	12962Click image for larger version. 

Name:	IMG_20140803_140400.jpg 
Views:	294 
Size:	349.4 KB 
ID:	12963

    After having the tubes as parallel as possible i messure the excact distnace and cut the rest of the spacers. Then i spot weld from the middle to the corners. After everything was in place i start to full weld the table. In order to avoid too much heat i make 2-3 cm welds at a time from one spacer to the other and from the on side to the opposite. So i pass along the table 20-55 times( welding and cleaning the welds). In order to have better welding results i rise the table to have better angle
    Click image for larger version. 

Name:	IMG_20140803_154622.jpg 
Views:	303 
Size:	418.7 KB 
ID:	12964Click image for larger version. 

Name:	IMG_20140803_154636.jpg 
Views:	309 
Size:	190.0 KB 
ID:	12965Click image for larger version. 

Name:	IMG_20140803_154701.jpg 
Views:	277 
Size:	393.6 KB 
ID:	12966
    End of the day and after turning the table upside down to full weld all the sides, i think the result is more than acceptable
    Click image for larger version. 

Name:	IMG_20140803_181524.jpg 
Views:	293 
Size:	306.9 KB 
ID:	12967Click image for larger version. 

Name:	IMG_20140803_181535.jpg 
Views:	291 
Size:	469.3 KB 
ID:	12968Click image for larger version. 

Name:	IMG_20140803_181515.jpg 
Views:	350 
Size:	320.7 KB 
ID:	12969Click image for larger version. 

Name:	IMG_20140803_173749.jpg 
Views:	306 
Size:	302.8 KB 
ID:	12970
    0.0-0.1 radius ( messured at different spots) the offset between the upper rails and the vertical pieces.
    This offset will be zero after epoxy ( ...i hope so )


    Next step is to make the tuning foots. That is why i weld a 80mm piece at every leg with a hole in the middle to pass the m18 bolt.
    Click image for larger version. 

Name:	IMG_20140803_123203.jpg 
Views:	290 
Size:	421.5 KB 
ID:	12971
    Then the epoxy method will take place

    Till now i think it must be nearly 200 kgr. The winch save me from a lot of work
    Thansk for your comments
    P.s Do you think that the legs should be connected at the lower part of the table?

    Vagelis
    Last edited by ba99297; 03-08-2014 at 07:21 PM.
    The creative adult, is the child who survived

Page 13 of 23 FirstFirst ... 31112131415 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. BUILD LOG: New build.Stell frame cnc 1500X1000.Ball screw and gearing calculations
    By ba99297 in forum DIY Router Build Logs
    Replies: 12
    Last Post: 03-09-2013, 10:37 PM
  2. Adjustable spindle mount?
    By cncJim in forum Marketplace Discussion
    Replies: 2
    Last Post: 19-06-2013, 08:58 PM
  3. Your Opinion
    By PWD in forum Milling Machines, Builds & Conversions
    Replies: 4
    Last Post: 22-05-2012, 11:02 AM
  4. Opinion about the structure of the router ...
    By C.AlveSilva in forum Gantry/Router Machines & Building
    Replies: 11
    Last Post: 01-05-2012, 02:03 PM
  5. WANTED: adjustable tailstock
    By johngoodrich in forum Items Wanted
    Replies: 0
    Last Post: 29-03-2012, 07:38 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
  •