. .
Page 6 of 36 FirstFirst ... 4567816 ... LastLast
  1. #51
    Clive S's Avatar
    Lives in Marple Stockport, United Kingdom. Last Activity: 18 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,333. Received thanks 618 times, giving thanks to others 78 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Looking very nice ad sturdy.

    This is how I got my beams sorted I welded 15mm plates on each end and then had them machined parallel and to length. I also had two faces of the box machined to get the box section true so that the front plate could be bolted to the beams true.

    Click image for larger version. 

Name:	CIMG1799.JPG 
Views:	457 
Size:	530.1 KB 
ID:	18552Click image for larger version. 

Name:	CIMG1804.JPG 
Views:	471 
Size:	386.3 KB 
ID:	18553Click image for larger version. 

Name:	CIMG1814.JPG 
Views:	477 
Size:	431.8 KB 
ID:	18554
    ..Clive
    The more you know, The better you know, How little you know

  2. The Following 2 Users Say Thank You to Clive S For This Useful Post:


  3. #52
    Cheers Clive, good method.

    Had a go at sorting out the beams today. I set the front beam using the datums I'd left on the bed:
    Click image for larger version. 

Name:	IMG_4565.jpg 
Views:	338 
Size:	195.7 KB 
ID:	18555

    I used some shims to take out the slight rocking on the underside and get a better clamp:
    Click image for larger version. 

Name:	IMG_4566.jpg 
Views:	316 
Size:	175.2 KB 
ID:	18556

    I then started to skim the face of one of the beams taking off as little as possible. I'd hoped this would only need to remove the high spots but in the end I had to machine back the entire face to get back to a level surface everywhere. Probably had a slight twist in it.
    Click image for larger version. 

Name:	IMG_4567.jpg 
Views:	346 
Size:	287.9 KB 
ID:	18557

    Looked good. Actually this is the first bit of steel I've machined on this CNC and I did get covered in tiny showers of swarf. As it is hot today I had a T-shirt on and they were very hot!

    Anyway, then I offered it up to the gantry and as I tightened the bolts I watched for any movement - there was none. I tightened all of the bolts then tried to rock the assembly and unlike before it was solid, there was no rocking on the base plates which means success! Very happy and back on track. Hopefully the other beam is just as straightforward.

    Click image for larger version. 

Name:	IMG_4568b.jpg 
Views:	369 
Size:	143.8 KB 
ID:	18558

    Click image for larger version. 

Name:	IMG_4569.jpg 
Views:	369 
Size:	223.3 KB 
ID:	18559

    Click image for larger version. 

Name:	IMG_4570.jpg 
Views:	320 
Size:	291.8 KB 
ID:	18560

    Looks quite nice although the steel bits will all get painted.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  4. #53
    Looking good, good luck with the next beam!

    .Me
    .Me

  5. #54
    Well I haven't moved onto the 2nd beam yet for 2 reasons. Firstly I've decided to do all the work on the first beam and make sure it is all going to work out. Secondly, although the outer face is now machined flat, I realised that the lower face is not flat enough. So I started by machining that square to the outer face (part is upside down):

    Click image for larger version. 

Name:	IMG_4597.jpg 
Views:	314 
Size:	189.6 KB 
ID:	18768

    It now sits properly on the base plate and is square to the outer surface:
    Click image for larger version. 

Name:	IMG_4603.jpg 
Views:	271 
Size:	133.3 KB 
ID:	18769

    I then flipped it over and spotted all the rail fixing holes in the top surface for the rail.

    Next up was to add the reinforcement plate on the inside. I chopped 2 bits to length using the new Rage saw - really easy and quick:
    Click image for larger version. 

Name:	IMG_4628.jpg 
Views:	342 
Size:	207.7 KB 
ID:	18766

    I used metal epoxy to glue the strip in having first sanded and de-greased both surfaces. I then knocked them both with my knuckle and the epoxied strip one doesn't ring like the other beam. Although I'd added this strip to give reinforcement and extra depth to the rail bolts it has also helped with the resonance. Might help with the cut finish a bit:


    Then opened out the small spots made on the cnc machine and then drilled and tapped the rail mounting holes to M5:
    Click image for larger version. 

Name:	IMG_4637.jpg 
Views:	332 
Size:	266.4 KB 
ID:	18770
    Click image for larger version. 

Name:	IMG_4638.jpg 
Views:	311 
Size:	284.6 KB 
ID:	18771

    I haven't machined this top surface yet as I will do it as a pair with the rear beam to get them exactly the same. Although they will have 5mm deep epoxy on top to mount the rails on, and therefore don't need to be machined, the 'MDF mould' I'm drawing to pour the epoxy into needs to sit on a very flat surface. I'll show more when I've finished the design of this mould part.

    Then a trial fit and it sits squarely on the base plate too now:
    Click image for larger version. 

Name:	IMG_4642.jpg 
Views:	359 
Size:	143.4 KB 
ID:	18772

    Click image for larger version. 

Name:	IMG_4643.jpg 
Views:	455 
Size:	251.5 KB 
ID:	18773

    There is another bolt to go inside on the lower face, plus 2 holes to drill in the inner vertical face to add another connecting block. Basically the RHS will be supported on all 4 sides so should be a pretty good joint when done. Then the end plate will go back on with the stepper mount in.

    Finally, something I wondered about recently. All the spot drills I've bought and used have been 90 degrees. The twist drill is 118 degs so when it goes into the hole it contacts only a 2 points until it gets going which is a bit hard on the drill cutting edges. Centre drills are 60 degrees so same problem. I had a look specifically for 118 deg spot drills on ebay and they only came up on the american ebay site and there weren't that many. I didn't look for long so could be me but are the 118 deg spot drills not popular? Or are 90 deg spot drills designed to give good centering alignment on 118 deg drills?
    Last edited by routercnc; 24-06-2016 at 11:04 PM. Reason: pictures fixed
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  6. #55
    Other jobs around the house mean slow progress in the build. I've managed to get the second beam machined.

    Click image for larger version. 

Name:	IMG_4698.jpg 
Views:	301 
Size:	207.1 KB 
ID:	18998

    Click image for larger version. 

Name:	IMG_4700.jpg 
Views:	290 
Size:	163.8 KB 
ID:	18999

    Drilled and tapped the M5 holes. I bought this spiral fluted tap which has different colour bands for different materials. I thought I'd try this yellow one (for steel) and it works really well.
    Click image for larger version. 

Name:	IMG_4837.jpg 
Views:	329 
Size:	209.0 KB 
ID:	19000

    I've sprayed them with a light dusting of zinc galvanising spray (screwfix) just to keep the rust off and make them look presentable. I've found this sticks well to metal and resists scratching. (Note Spitfire languishing in the background )
    Click image for larger version. 

Name:	IMG_4845.jpg 
Views:	379 
Size:	128.7 KB 
ID:	19001

    Click image for larger version. 

Name:	IMG_4847.jpg 
Views:	322 
Size:	146.6 KB 
ID:	19002

    Next job is to put it all together, shimming if required, then set it aside. Then move onto making parts for the bed.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  7. The Following 3 Users Say Thank You to routercnc For This Useful Post:


  8. #56
    I've put off assembling the gantry parts for now and moved on to making the bed rail supports. Here is the basic bed structure and the parts I'm making now are the large RHS sections on top of the uprights (highlighted).
    Click image for larger version. 

Name:	bed_CAD.jpg 
Views:	305 
Size:	263.4 KB 
ID:	19124

    First job is the chop the RHS down to the right length. The Rage saw cut through in about 30 seconds, with minimal effort and just a few sparks. The section is 100x60x5mm wall thickness steel so very impressed:
    Click image for larger version. 

Name:	IMG_4931.jpg 
Views:	289 
Size:	160.5 KB 
ID:	19123

    Click image for larger version. 

Name:	IMG_4933.jpg 
Views:	297 
Size:	347.0 KB 
ID:	19125

    Light dusting of zinc spray to make the marking out/spot drills easier to see:
    Click image for larger version. 

Name:	IMG_4934.jpg 
Views:	245 
Size:	193.5 KB 
ID:	19126

    Dialling it in as best I could - it bumped around a bit when jogging along the edge but I got it pretty much aligned. From memory I think it was within 0.3mm high to low spots.
    Click image for larger version. 

Name:	IMG_4939.jpg 
Views:	275 
Size:	164.9 KB 
ID:	19127

    Then onto spotting all the holes. It is longer than the machine so I did 80% of them, then pushed the part back and zeroed off the last hole to finish it off. Bit fiddly but actually not too much work.
    Click image for larger version. 

Name:	IMG_4946.jpg 
Views:	260 
Size:	190.3 KB 
ID:	19128

    Then onto the drill press to get to work on it:
    Click image for larger version. 

Name:	IMG_4955.jpg 
Views:	281 
Size:	124.3 KB 
ID:	19129

    I had some M6 holes to tap so used a generic spiral fluted tap but it did not feel good. The effort was high and I could see it twisting. In aluminium it was fine, but this was not going well and the thought of it breaking was too much. So off to ebay to get another yellow ring (steel) tap from Europa tool. Tried it out and the effort was much lower. It made short work of the threading, so ~£7 well spent I think.
    Click image for larger version. 

Name:	IMG_4961.jpg 
Views:	272 
Size:	243.5 KB 
ID:	19130

    Next job was always going to be a bit tricky as one set of the M5 rail mounting holes was on the radius. I spotted them on the cnc and went very slowly to reduce deflection. But drilling them on the pillar drill was not working - the bit was clearly deflecting away.
    Click image for larger version. 

Name:	IMG_4953.jpg 
Views:	244 
Size:	265.5 KB 
ID:	19131

    So I knocked up a drilling jig:
    Click image for larger version. 

Name:	IMG_4965.jpg 
Views:	280 
Size:	338.7 KB 
ID:	19132
    The existing tapped holes help locate the fixture to drill out the holes on the radius. I drilled the holes in the fixture a very close fit to the bolt diameter so am using them a bit like dowel pins - thought about getting some shoulder bolts but didn't need to in the end. Just tried drilling one of the holes (with a cordless drill as a quick test) and it picks up the spot drill mark and works well. Will do them all properly on the pillar drill.
    Click image for larger version. 

Name:	IMG_4966.jpg 
Views:	285 
Size:	259.5 KB 
ID:	19133

    Click image for larger version. 

Name:	IMG_4971.jpg 
Views:	266 
Size:	234.8 KB 
ID:	19134

    In case you were wondering there will be 5mm epoxy on top of the rails which will 'fill in' the radius to create a flat surface to mount the rail. For now they are supported 16mm rail, but I've done CAD checks for 20mm linear profile square rail and it will fit fine and just needs a simple interface plate to bolt it to the gantry. But at 1100mm they get expensive so I'm not buying them at this point.

    Next up is some simple holes in the side (will do these the 'old way' scribe, centre punch, spot, drill . . . ) and then repeat the whole lot as a mirror image on the other one.

    I've also cut up all the vertical supports which go between the rail and the bed:
    Click image for larger version. 

Name:	IMG_4930.jpg 
Views:	261 
Size:	250.1 KB 
ID:	19135
    These need the holes drilling out to around 9.0mm to allow 120mm long M8 bolts to pass right through and into a nut / nut plate in the lower extrusion channel (not shown), bolting the RHS rail and the uprights to the bed in one go. I think this will be better than using lots of little L brackets.
    Click image for larger version. 

Name:	bed_bolts.jpg 
Views:	267 
Size:	124.6 KB 
ID:	19136

    All for now . . .
    Last edited by routercnc; 02-09-2016 at 09:38 PM.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  9. The Following 4 Users Say Thank You to routercnc For This Useful Post:


  10. #57
    The uprights have been drilled out to 9mm to allow the bolts to pass through, and the ends have been machined flat both end to give 100mm length. You will notice there are only 7 of them - one was cut slightly short so I need to cut another one.
    Click image for larger version. 

Name:	IMG_5420.jpg 
Views:	239 
Size:	263.7 KB 
ID:	19800

    I've stopped work on the bed rails because tapping on the radiused edge of the RHS was proving to be a problem. The 5mm tap felt like it was going to break when it partly broke through the other side, basically cutting a thread only along one edge. I've got a plan B which is to machine the area out completely and weld in some threaded bosses. More to come on that one.

    Back to the gantry. I've been making good use of my new lathe and made 2off ballscrew floating bearing holders. Here is a walk through starting with the drawing:
    Click image for larger version. 

Name:	IMG_5438.jpg 
Views:	228 
Size:	163.1 KB 
ID:	19785

    The part was hidden in here somewhere, just needed to get it out:
    Click image for larger version. 

Name:	IMG_5440.jpg 
Views:	223 
Size:	226.2 KB 
ID:	19786

    Turned the outer diameter to size, then drilled and tapped the M8 hole:
    Click image for larger version. 

Name:	IMG_5441.jpg 
Views:	232 
Size:	167.1 KB 
ID:	19787

    Then turned the part around, but was not confident on parting off the waste so cheated and used a hacksaw (lathe not turning).
    Click image for larger version. 

Name:	IMG_5442.jpg 
Views:	216 
Size:	215.8 KB 
ID:	19788

    Then onto the boring of the internal features:
    Click image for larger version. 

Name:	IMG_5443.jpg 
Views:	209 
Size:	165.9 KB 
ID:	19789

    As mentioned in another thread I bought a pair of calipers to check the critical bore diameter - it needed to house a sliding fit bearing, so I had to get it close. These are ~OK, but the adjustment handle is a bit low quality.
    Click image for larger version. 

Name:	IMG_5444.jpg 
Views:	218 
Size:	314.9 KB 
ID:	19790

    It seems to have a quick release slide facility - don't know if this is intentional or not? Maybe I'll replace it with a nice brass one now I have a lathe.
    Click image for larger version. 

Name:	IMG_5446.jpg 
Views:	209 
Size:	249.3 KB 
ID:	19791

    Here are the finished parts:
    Click image for larger version. 

Name:	IMG_5455.jpg 
Views:	200 
Size:	137.7 KB 
ID:	19792

    Bearing lightly pushed in a bit to check it will work OK:
    Click image for larger version. 

Name:	IMG_5456.jpg 
Views:	201 
Size:	116.1 KB 
ID:	19793

    Onto the adjustable brackets which are made from 25mm thick stock. I had to remove the clamp on the chop saw to fit it. This cut through 90% of it:
    Click image for larger version. 

Name:	IMG_5431.jpg 
Views:	225 
Size:	162.9 KB 
ID:	19794
    Then I turned it around and cut the last bit off:
    Click image for larger version. 

Name:	IMG_5433.jpg 
Views:	188 
Size:	190.7 KB 
ID:	19795
    Took about 5 minutes taking it steady. Very impressed with this saw.

    Onto the CNC machine:
    Click image for larger version. 

Name:	IMG_5436.jpg 
Views:	211 
Size:	294.7 KB 
ID:	19796

    First one machined out:
    Click image for larger version. 

Name:	IMG_5466.jpg 
Views:	232 
Size:	460.7 KB 
ID:	19797

    Here it is next to the bearing housing:
    Click image for larger version. 

Name:	IMG_5471.jpg 
Views:	233 
Size:	195.9 KB 
ID:	19798

    Trial fit:
    Click image for larger version. 

Name:	IMG_5472.jpg 
Views:	217 
Size:	192.5 KB 
ID:	19799
    Click image for larger version. 

Name:	IMG_5473.jpg 
Views:	202 
Size:	162.9 KB 
ID:	19802

    Last job is to counter bore and drill out the 4 mounting holes, then repeat on the second one. This screenshot is a bit out of date but the ballscrew mounts are on the far right of the gantry:
    Click image for larger version. 

Name:	rend5_gantry.jpg 
Views:	237 
Size:	188.7 KB 
ID:	19801
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  11. #58
    I've finished the second bearing housing:
    Click image for larger version. 

Name:	IMG_5484.jpg 
Views:	164 
Size:	182.4 KB 
ID:	19976

    Then onto machining the counterbores . . .
    Click image for larger version. 

Name:	IMG_5487.jpg 
Views:	226 
Size:	306.8 KB 
ID:	19977

    . . . and making pilot holes
    Click image for larger version. 

Name:	IMG_5488.jpg 
Views:	192 
Size:	253.4 KB 
ID:	19978

    They were finished off on the drill press:
    Click image for larger version. 

Name:	IMG_5491.jpg 
Views:	205 
Size:	204.6 KB 
ID:	19980

    Trial fit:
    Click image for larger version. 

Name:	IMG_5490.jpg 
Views:	203 
Size:	209.7 KB 
ID:	19981

    Then back to the bed rail supports. On the original CAD I'd forgotten to include the radius on the edge of the box section, meaning the threaded holes were on a corner. Drilling and tapping these turned out to be a bad idea so I needed a plan B. So I decided to machine out some pockets and insert some threaded bosses. Here are the bosses - took quite a long time to machine all 16, but they are done now:
    Click image for larger version. 

Name:	IMG_5485.jpg 
Views:	205 
Size:	192.3 KB 
ID:	19982

    Then machining out the pockets:
    Click image for larger version. 

Name:	IMG_5492.jpg 
Views:	217 
Size:	289.9 KB 
ID:	19983
    Click image for larger version. 

Name:	IMG_5495.jpg 
Views:	190 
Size:	156.4 KB 
ID:	19986

    Trial fit - a gentle sliding fit. They locate themselves, but I'll still knock up a little jig to hold them in place so they don't move when being welded
    Click image for larger version. 

Name:	IMG_5494.jpg 
Views:	197 
Size:	157.1 KB 
ID:	19984

    Click image for larger version. 

Name:	IMG_5498.jpg 
Views:	180 
Size:	146.3 KB 
ID:	19985

    Still need to finished the other rail support in the same way, then off to a friends to be welded in.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  12. #59
    Clive S's Avatar
    Lives in Marple Stockport, United Kingdom. Last Activity: 18 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,333. Received thanks 618 times, giving thanks to others 78 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Very nice indeed its a credit to you. Would you mind telling me where you got the vise from in pic 3 its is very neat.
    ..Clive
    The more you know, The better you know, How little you know

  13. Ahhh this thread stresses me out! It's all toooo nice! Keep it up though I want to see this beut finished!!


    Sent from my iPhone using Tapatalk

Page 6 of 36 FirstFirst ... 4567816 ... LastLast

Thread Information

Users Browsing this Thread

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

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
  •