Printable View
Looking very nice ad sturdy.:applouse:
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.
Attachment 18552Attachment 18553Attachment 18554
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:
Attachment 18555
I used some shims to take out the slight rocking on the underside and get a better clamp:
Attachment 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.
Attachment 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.
Attachment 18558
Attachment 18559
Attachment 18560
Looks quite nice although the steel bits will all get painted.
Looking good, good luck with the next beam!
.Me
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):
Attachment 18768
It now sits properly on the base plate and is square to the outer surface:
Attachment 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:
Attachment 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:
https://www.youtube.com/watch?v=Pu8Z...ature=youtu.be
Then opened out the small spots made on the cnc machine and then drilled and tapped the rail mounting holes to M5:
Attachment 18770
Attachment 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:
Attachment 18772
Attachment 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?
Other jobs around the house mean slow progress in the build. I've managed to get the second beam machined.
Attachment 18998
Attachment 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.
Attachment 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 :apologetic:)
Attachment 19001
Attachment 19002
Next job is to put it all together, shimming if required, then set it aside. Then move onto making parts for the bed.
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).
Attachment 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:
Attachment 19123
Attachment 19125
Light dusting of zinc spray to make the marking out/spot drills easier to see:
Attachment 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.
Attachment 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.
Attachment 19128
Then onto the drill press to get to work on it:
Attachment 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.
Attachment 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.
Attachment 19131
So I knocked up a drilling jig:
Attachment 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.
Attachment 19133
Attachment 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:
Attachment 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.
Attachment 19136
All for now . . .
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.
Attachment 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:
Attachment 19785
The part was hidden in here somewhere, just needed to get it out:
Attachment 19786
Turned the outer diameter to size, then drilled and tapped the M8 hole:
Attachment 19787
Then turned the part around, but was not confident on parting off the waste so cheated and used a hacksaw (lathe not turning).
Attachment 19788
Then onto the boring of the internal features:
Attachment 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.
Attachment 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.
Attachment 19791
Here are the finished parts:
Attachment 19792
Bearing lightly pushed in a bit to check it will work OK:
Attachment 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:
Attachment 19794
Then I turned it around and cut the last bit off:
Attachment 19795
Took about 5 minutes taking it steady. Very impressed with this saw.
Onto the CNC machine:
Attachment 19796
First one machined out:
Attachment 19797
Here it is next to the bearing housing:
Attachment 19798
Trial fit:
Attachment 19799
Attachment 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:
Attachment 19801
I've finished the second bearing housing:
Attachment 19976
Then onto machining the counterbores . . .
Attachment 19977
. . . and making pilot holes
Attachment 19978
They were finished off on the drill press:
Attachment 19980
Trial fit:
Attachment 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:
Attachment 19982
Then machining out the pockets:
Attachment 19983
Attachment 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
Attachment 19984
Attachment 19985
Still need to finished the other rail support in the same way, then off to a friends to be welded in.
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.
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