Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
jips
Cool stuff! Yes that enclosure and control look great. I talked to Defeng about incorporating a tough screen a while back, is this a touch-capable screen?
Don't worry about the accent either, waiting for your channel!
Re: Show how to build a CNC machine from the very beginning to the end
Hi Jips, if you have contact with Defeng would you ask him to check and answer questions that are being asked on his web site's support email address. I have a question related to the spindle drive but have had no luck in getting a response from any method known to me, and I know others have asked questions using that email address and got no response as well.
Thanks,
John
Re: Show how to build a CNC machine from the very beginning to the end
LOL,,,,,,,a French accent is not off putting, in fact it's quite soft on the ears, better by far than a German one....also a bit more expressive ........at least your English is better than my French and you can make yourself understood....."parly voo fronsay"?....."not a damm bit old sport"....LOL.
Back to the grind..........without ruffling any feathers, prior to CNC production methods, the only commonly used milling approach was hook milling or conventional milling....."going against the cutter"..........if the cutters were designed then to maximise their life you can bet your boots conventional milling is my choice.
Just for a bit of diversity........in a climb mill mode and roughing.........the first point to contact the work piece is the sharp pointy corner of the cutter at the very bottom of the helix and this contacts the work piece against a solid face like a hammer blow.
To say that it is better for the sharp corner to take the impact loading of the feed rate leaves me wondering if the cutter manufacturers have got it all wrong all these years......carbide milling inserts have a small flat angle or a radius at their bottom edge........ground carbide cutters do not and inserts do not have a helix.....two different geometries for the same cutter material.
At the same time, when in climb mode, the cutter enters the work piece against the flat face and as it rotates 180 deg it now moves in the same direction as the work is moving.....this has a tendency for the chip ejection velocity to slow down and hang onto the flute of the cutter and not be ejected rapidly......... which gives a slowing down effect to the feed rate just when you need to have the velocity of the chip ejection the most......probably the main reason why aluminium sticks to a cutter and does not cleanly eject when climb milling.
Re-milling chips mainly occurs when you are in a slot......on a flat face with hook milling the chips get ejected away from the cutter......they can also be dragged into the cutter with hook milling but as the cutter is moving forward there would have to be a mountain of chips burying the cutter for that to frequently happen.
If a chip is in the path of a cutter when climb milling then it will most certainly be recut as the cutter has a flat face for it to be jammed against.
I think a strong air blast with some coolant too would be highly effective in clearing the path to prevent chips from being recut.
Cutter deflection is also a recipe for chips to get between the cutter and the work piece.
Ian.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
jips
Hi,,,,that has to be a most professional looking CNC enclosure........no wonder Defeng is not so active on the forum, he's been very busy.........I hate to think how much that package would cost., definitely aimed at the SVM-1 and 2 market.
Just one criticism ........in the 3rd photo it shows an access door at the back of the cabinet........this means the cabinet has to be positioned completely clear from a back wall or else you won't be able to get into it, maybe if you have the luxury of a large workshop this is no problem.
Having that much space behind the cabinet is a waste of space when the door may only be opened if ever once in a blue moon.
Ian.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
I think a strong air blast with some coolant too would be highly effective in clearing the path to prevent chips from being recut.
But not for you. Imagine the constant sound of air wishhhhing away chips.....................This is where your electromagnets come in Right?
Just way too funny..................even trying to second guess the tool manufacturers.
For a guy that worked on airplanes, you don't know the difference between conventional and climb milling? They teach you that first few weeks as an apprentice. First day as an employed machinist the supervisor or owner tells you what machine can and can't handle it.
Stop trying to perpetuate your presence here by commenting on everything you know nothing about. Go play with your machine.
Re: Show how to build a CNC machine from the very beginning to the end
Yeah, I'm out on this one.
Glad the OP produced something worth using, but this thread has long since devolved into an epic **** show.
You're on your own, HandleFapper. Enjoy applying your immense theoretical knowledge to cutting air with pointy sticks.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
handlewanker
Hi,,,,that has to be a most professional looking CNC enclosure........no wonder Defeng is not so active on the forum, he's been very busy.........I hate to think how much that package would cost., definitely aimed at the SVM-1 and 2 market.
Just one criticism ........in the 3rd photo it shows an access door at the back of the cabinet........this means the cabinet has to be positioned completely clear from a back wall or else you won't be able to get into it, maybe if you have the luxury of a large workshop this is no problem.
Having that much space behind the cabinet is a waste of space when the door may only be opened if ever once in a blue moon.
Ian.
Hi Ian, I've been cutting some steel on my SVM2 with flood coolant turned on, I don't know too much about it yet, but I can tell you there is a very good electrical reason it is back there, and not facing forward into the enclosure. I'm very glad I ordered the full enclosure, this thing throws chips in all directions, but none have made around there yet.
regards,
John
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
G59
But not for you. Imagine the constant sound of air wishhhhing away chips.....................This is where your electromagnets come in Right?
Just way too funny..................even trying to second guess the tool manufacturers.
For a guy that worked on airplanes, you don't know the difference between conventional and climb milling? They teach you that first few weeks as an apprentice. First day as an employed machinist the supervisor or owner tells you what machine can and can't handle it.
Stop trying to perpetuate your presence here by commenting on everything you know nothing about. Go play with your machine.
G59......you are an idiot and I say that without any reserve..............I learned milling in the late 50's and climb milling was one thing you DID NOT DO UNDER ANY CIRCUMSTANCES.
You could climb mill with a hydraulic buffer to prevent the table from being dragged into the cutter, but for the normal every day milling it was ALWAYS hook milling or conventional milling.
The fact that climb milling is a CNC trait is of no consequence....you play the game according to how you analyse the play.
As for the air......I did say YOU, AS IN YOU OR OTHERS who prefer to have an air solution to their needs.
You're on my ignore list so I won't respond to any more stupid remarks you make out of context.
Ian.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
johnno402002
Hi Ian, I've been cutting some steel on my SVM2 with flood coolant turned on, I don't know too much about it yet, but I can tell you there is a very good electrical reason it is back there, and not facing forward into the enclosure. I'm very glad I ordered the full enclosure, this thing throws chips in all directions, but none have made around there yet.
regards,
John
Hi, I have the full enclosure too for the SVM-0 .....for that model flood coolant was not a design feature according to Defeng.....he advised using mist coolant.........maybe the enclosure has had a design change since then......yours being for the 2 model is a totally different design and would need to be well sealed for flood coolant.
One thing that I did comment on previously was the fact that the mill (mine) sits directly on the painted steel bottom of the cabinet and has no sealing around the base or the holes for the holding down bolts.........any water based coolant will collect under the base and rust the bottom out.
The enclosure I commented on appears to be one designed for the SVM-1 & 2 mills and the rear opening door does mean you need rear access to get into it.......mine has an access door opening to the right side and that means the cabinet back can be placed close to a wall.
Ian.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
tmarks11
So what you are saying is the 17 or so Concordes sitting at museums around the world have pieces of them that you made.
Hi....yes precisely that.....parts for the engines and fuel systems ......the firm I worked for in the 70's had the contracts to supply the parts and I was the one who made them........no big deal as it was just another line of work.
At the same time too I made parts for practically all the Nato fighters of that time.......our firm had very close contacts with the Rolls Royce R&D department and quite frequently drawings they submitted for tender got redesigned and resubmitted for approval.
Ian.
Re: Show how to build a CNC machine from the very beginning to the end
Too . . . Easy . . . Can't . . . Resist . . .
Quote:
Originally Posted by
handlewanker
......you are an idiot and I say that without any reserve..............
Mr. Kettle, I have a Mr. Pot on the line for you, he says "You're black."
Quote:
Originally Posted by
handlewanker
I learned milling in the late 50's and climb milling was one thing you DID NOT DO UNDER ANY CIRCUMSTANCES.
Have a lot of machines with pre-loaded ballscrews and servo motors back there in the 1950's did they?
You ought to just be honest and say outright that your main goal here is to talk at length about how impressively smart you are.
That's what every post you make boils down to. Ask for advice, get advice, dismiss advice because you know better, then explain WHY you know better, then take offense when others disagree and talk about how your vast manual machining experience (of which I have seen precious little proof) makes your opinion "correct".
Re: Show how to build a CNC machine from the very beginning to the end
Please don't feed the troll and maybe it will go away!!!
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
gadgets
Please don't feed the troll and maybe it will go away!!!
You're quite right.
I've put him on ignore so I won't be tempted further.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
louieatienza
Cool stuff! Yes that enclosure and control look great. I talked to Defeng about incorporating a tough screen a while back, is this a touch-capable screen?
Don't worry about the accent either, waiting for your channel!
Yes it's a touch screen
Envoyé de mon GT-N7100 en utilisant Tapatalk
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
johnno402002
Hi Jips, if you have contact with Defeng would you ask him to check and answer questions that are being asked on his web site's support email address. I have a question related to the spindle drive but have had no luck in getting a response from any method known to me, and I know others have asked questions using that email address and got no response as well.
Thanks,
John
I will , he is crazy busy at time ( a good thing because it meens "works")
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Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
handlewanker
Hi, I have the full enclosure too for the SVM-0 .....for that model flood coolant was not a design feature according to Defeng.....he advised using mist coolant.........maybe the enclosure has had a design change since then......yours being for the 2 model is a totally different design and would need to be well sealed for flood coolant.
One thing that I did comment on previously was the fact that the mill (mine) sits directly on the painted steel bottom of the cabinet and has no sealing around the base or the holes for the holding down bolts.........any water based coolant will collect under the base and rust the bottom out.
The enclosure I commented on appears to be one designed for the SVM-1 & 2 mills and the rear opening door does mean you need rear access to get into it.......mine has an access door opening to the right side and that means the cabinet back can be placed close to a wall.
Ian.
First thing I did was to seal with silicon all the floor plan but more for the small chips that may come in the gap than coolant( with the mql system no coolant accumulation it evaporate with the cut and keep the chips clean) i clean the mill ench end of day a i use to at my old job on a big mori cnc lathe keeping the "5s / iso9001" methid as much as i can is great for organizations
http://uploads.tapatalk-cdn.com/2016...e9a06a06a6.jpghttp://uploads.tapatalk-cdn.com/2016...40f1ccca5c.jpg
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Re: Show how to build a CNC machine from the very beginning to the end
Hi Jips, I wish I would have done that on mine before I used it, mine is leaking, and out of an unexpected spot, the top screw of the top hinge on the door of the bottom cabinet. The square tube upright in the corner of the cabinet must be full of coolant. I'll have to give it a good clean to get the oily film off left from the coolant.
Ian, sorry mate, I thought you were after something like that shown in the half height enclosure shown a few days ago, it had the door opening into the mill enclosure. On the right side would work well, as you say.
Re: Show how to build a CNC machine from the very beginning to the end
Quote:
Originally Posted by
handlewanker
......I learned milling in the late 50's and climb milling was one thing you DID NOT DO UNDER ANY CIRCUMSTANCES....The fact that climb milling is a CNC trait is of no consequence....you play the game according to how you analyse the play.
OK, now I am confused. This is a thread about cnc? Which means it is about how to cut things the proper way with CNC?
Your sports metaphor is like using a miniature golf handbook to learn how to professionally golf.
Re: Show how to build a CNC machine from the very beginning to the end
Ian, there may be more of your so called "hammer" effect with a straight flute, but with helical flutes it's more of a shearing effect. Also tool materials, production and geometries have improved greatly.
There's no debate as to what happens, slow motion cameras have captured this at over 1000 frames per second. You can go on YouTube and see for yourself.
Using your reasoning about using what we learned 40 years ago, we'd still be insulating with asbestos, adding lead to paint, using CFCs in aerosol cans... and conventional milling aluminum.
Re: Show how to build a CNC machine from the very beginning to the end
The machine really should be up off the sheet metal some. The base can start dripping from condensation is shop shops and without a way to dry, it can start to deteriorate.
If it were mine, it would be sitting on rubber pads. Is the tray open under the mill?