October 13, 2018, 2:48 pm
Thanks in advance! I'm a 20 yr. veteran cnc high volume grinding machine mechanic. I'm currently having issues with a small ID bore grind having an oval shaped roundness issue. Tolerance for roundness is 0.00075 mm, I'm at 0.0015 mm roundness.
Machine is a Sweeden made UVA, model # U88NMAH22, built in 2000.
I'm using a spring style diaphragm chuck with six jaws ground true to zero runout. Style of chuck allows for no clamp pressure adj., air pressure expands chuck diaphragm open, spring force closes. Just wanted to be clear on style of part chucking.
Other parameters are chuck speed at 1900 rpm and high speed spindle at 90,000 rpm. with a oscillating stoke and slow infeed. Cutting tool is a Meister CBN wheel at 3.8 mm dia. And the part is 5.7 mm long with a bore diameter of 4.305mm.
And finally here's the kicker....machine has 2 separate chucks, each using the same grind wheel / spindle and same grind parameters whereas chuck #1 has no roundness issues. Chuck 2 jaws have been replaced, chuck spindle bearings replaced, spindle to bore center line set, both vertical and horizontal. All other measurements are good, parallelism, straightness, etc.
Any info, suggestions and help is greatly appreciated.
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October 14, 2018, 5:55 am
Im trying to sort out the parameters on a YASNAC LX3. I have a list from another
machine or two and Ive got problems.
In the #7000's I need to input some negative values but HOW????
All positive values and zero can be punched in by hand as a binary or decimal value if
you cursor across to each digit or the end of the line to input as decimal. I cant
navigate round in here very well its all ass backwards if you ask me:cryin:
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October 14, 2018, 12:32 pm
Hi Everyone,
I have exponentially more experience with CNC mills and do five axis milling with Deckel Maho machines at this point. We have plenty of larger turning we farm out that we would like to do in-house and have two lathes readily available in storage but only room for one of them. I haven't been able to run either and I would like to hear what members that have actually run these machines think of them to help finalize the choice for us.
The lathes are both slant bed FAPT enabled Fanuc 10T controlled box-way machines so physically they are very comparable.
One is a Daewoo Puma 12L (Long version - 1050mm Z travel, 3" through bore) and the other is a Mori Seiki SL-6B (6.25" Big through bore version with Howa Pneumatic chuck).
I know typically Mori Seiki has a great reputation for this generation of turning center but I figured it couldn't hurt to ask anyway, most of what we will be doing is ID and OD API thread work from solid round bar on parts that range from 3" to 12" or more.
The Daewoo is a lighter lathe at around 15,600 lb and it has a belt/gearbox/belt/spindle drive system opposed to the heavier (20,000lb) gear driven Mori.
The Daewoo has a A2-8 hydraulic actuated (via drawbar) 12" chuck that can spin up to 2500 rpm whereas the Mori is A2-11 and maxes out at just over 1000 rpm. Daewoo max 1000 ish ft/lbs torque, Mori 2292 ft lbs. I think the Mori has at least 1 more gear than the Puma does.
The Mori has not only less Z travel (850mm) but the big air chuck eats up the distance between centers even more. I've never used an air chuck either so not sure what drawbacks there may be or if it might be a smart idea to just throw on a manual A2-11 4 jaw to get the Z back and keep the big bore?
The Mori has a programmable belt drive tailstock whereas the Puma is a manual drag along tailstock.
Probably the biggest pain about the Mori is the chip conveyor that must be removed from the end and cannot roll out with the coolant tank. I've read people suggest coolant touching the casting can cause accuracy problems but then I've also heard the SL series of this vintage are some of the best lathes made? Just the access needed for the chip conveyor in terms of floor space is a negative for the Mori SL. The Puma tank pulls out from the front and the conveyor can be removed by being lifted out by above or pulled out from the side. Most newer slant bed lathes look like they are built on the same architecture as the Puma, the Mori of that vintage is unique to them, but they ran with that casting design and changed the sheet metal for many years afterward.
Will having a max of 1000 rpm be a serious issue for finish on those smaller diameters? Threading is typically performed pretty slow anyway isn't it? Some pretty large drilling may come up 1.5" or more... but I imagine both lathes could handle it no problem.
A buddy near me has a big flat bed Haas with a 10" bore that has turned away some of the smaller threading work I would be doing because he said his max RPM made it not sensible to do the work. With 1000 rpm available what is the smallest dia I can go realistically in steel? 4140, 4330... I have a feeling someone is going to mention the SFM recommendation of the inserts being used, I'm not sure what happens if the part is run slower than these values? I have a Tree UP 1000 lathe with a 4000 rpm spindle and I think 1 ft lb of torque, maybe less. Heh.
Any thoughts, anecdotes or opinions are welcome on this. At this point we don't have nearly enough turning to justify a new purchase and would like make the most of what we have available.
Dave @ Nerv
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October 14, 2018, 9:44 pm
I am fairly new to cnc and have a question. I have an accupath cnc mill with the mx3 controller and am having problems lining my part back up after I restart my machine. I program a point as g55, but it seems to ever so slightly move after a reboot. Maybe .01 to .001 off of where it was. I have read a bit about this, but have limited knowledge. Is this because of my home switches not precise enough? They are mechanical switches with wheels vs optical.. Is this a normal thing? Am I on the right track or missing something? I assumed it would just remember without having to use my dial indicator to sweep the part every time I restart machine. I am fairly new to all this, so I apologize if this is a dumb question.. Thanks.
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October 14, 2018, 10:17 pm
G'day
I've just installed all the hardware for my 3 machines in my shop to connect them to a Switch Box which is connected to my PC.
However I seem to of hit a bit of a wall with my first tests at receiving programs from my machines to my PC, previously I was using an old version of NCLink and I thought it would be a simple case of copying parameters over from NCLink into DNC4U then mostly "plug n play" from there?
Guess not I feel like I'm making a simple error somewhere....
I am trying to use the DNC Wizard to setup a test run on my Mill but I either get a black screen Step 4 of 5 or a single letter/symbol on the black screen.
Can anyone help me please I am patient and will provide any information you need to help me.
Cheers
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October 15, 2018, 6:14 am
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October 15, 2018, 9:07 am
Hello,
How do I know the M-code number activating a renishaw probe (already installed on machine) for SIEMENS 840D measuring cycle?
Which parameter should I look for?
Thanks for the help.
Stephen
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October 15, 2018, 11:57 am
I just got my KIA lathe up and running and don't have a ton of tooling for it yet, but I have plenty of 3/4" tools for my manual lathe. If I make some nice, accurate, 1/4" thick L shaped spacers to get the tool in the right spot can I use those in my 1" holders, or should I suck it up and buy the 1" versions of my indexable threading and parting tools? I have a bunch of turning and facing tools inbound with a variety of inserts and styles, just not threading tools yet.
Side note- Does anyone know where to get the pins for VDI40 turrets? I have a few that have seen better days and I'd like to replace them. There are 14mm by ~20mm with an M10 thread for coolant transfer and 10mmx14mm with a 5mm thread for aligning the tools. I can't find dowels of that size with the thread on mcmaster or MSC. Might be a machine tool specific thing, or maybe I just need to turn my own.
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October 16, 2018, 1:30 am
I'm taking 3mm off all faces of some flame cut 304 stainless steel plate - tough, 300mm sq, 50mm thick - but am struggling to get above 80m/min (260 ft) on my cutting speed. I'm using these tips at the moment -
Cromwell Tools - Experts in Hand Tools, Power Tools and PPE - on an 80mm face mill, 2mm cut.
Anyone suggestions? Different tips? Different strategy completely?
I'm using CAM so could generate some small cut hsm style paths if that might help.
Cheers
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October 16, 2018, 1:56 am
Morning all,
I'm trying to write a macro programme for roughing out diameters in LMO (99.% ALU).
To start with i'm trying to keep the program as simple as possible and only cutting in the axial direction.
What i'm struggling with is how to define a depth of cut in the axial direction. so if the length of turn is to be 100 mm and i want to take a 10 mm cut (obviously 10 times)
Length: 100mm #5
DOC: 10mm #6
Counter:#500=0
#501=[#5/#6] then the program would cut along that length then pull off and arc back down to the next position.
Then i would use a DO1 until the #500 is EQ #5
This method works until the length becomes more precise and will encounter rounding errors etc.
Can anyone recommenced a different method?
If you would like me to post my current program , this will not be a problem.
Thanks
joe
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October 16, 2018, 7:24 am
I am getting conflicting advice, does anyone know if you can combine a C axis rotation with a 3 point probing basic rotation for part alignment?
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October 16, 2018, 8:31 am
Hey folks, looking for some info from people with experience on the Ganesh Gen Mill T-500 or T-700. From looking at their specs they seem like a pretty good machine, and good value. I've been hearing some impressive speed/feed numbers, and they come standard with some things that both Brother and Fanuc only offer as options. The T-700 has roughly 1000 lbs on the equivalent Brother, and almost double that on the equivalent Robodrill. The Mitsubishi control has a pretty impressive spec sheet, but I've never run one personally so don't have any experience with their quirks or benefits. Looks like the castings and assembly are in Taiwan, the electrical is all Mitsubishi, and guides/bearings are Japanese or European.
Anybody out there have any experience and feedback?
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October 16, 2018, 9:06 am
Howdy, Been a Haas guy for a number of years and I like them. But I am looking for an entry level VMC with a 4th axis wiring for around $80K.
How are the entry level Fanucs and Siemans, Mitsubeasty and Fagor
. And also looking at the Trak LMP with their PMX control. This is for a
University Shop so I need to spend wisely and choose what will last the poor dumb taxpayer as long as possible (" Given that this is funded by earnest tax payers (and I work for essentially a non-profit) I want to get the absolute best long terms value (even if that means I have to pay a little more).(thankyou cameraman !!) ". . Accuracy and long life is most import rather than speed. 75% will be soft easy material..... The other 25% will be nasty stuff like Areomet 100 and Inconelish stuff. Yes I know I won't get the perfect mill..... but I need to make every effort to come as close as possible. Also there is no way possible to get more money for this project so Yasda's are out. As of right now, Haas VF2 with some options and their 10% off for schools looks like the winner but I want to see if you may know about something I have not known about. Thanks for any help and wisdom you can send me. -mateo
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October 16, 2018, 2:44 pm
Hi all,
We have a job coming through at work which involves skimming and pocketing some large aluminium plates. One of the more experienced machinists worked out that the best way to work with the vacuum table is to 'pulse' the flood coolant to keep the cutter lubricated whilst avoiding swamping the vacuum table.
My boss has given me the task of developing an M code or some other form of macro to produce the pulses automatically. Unfortunately, I've never attempted anything like this before and am not sure how to go about it.
The machine is a Mazak VCN530C with a smoothM control and will be running the plates from a subprogram produced in mastercam. Is there anyone out there who has done anything like this before? Is it possible? My main concern is that the machine will get hung up on the coolant macro and loop that as a pose to machining the part.
I've used macro programming before and this is my basic idea for the code:
N10
#3001=0 (timer 1 to zero)
N20
IF[#3001LT#1*1000]GOTO20 (wait for coolant off time)
#3002=0 (timer 2 to zero)
#<FCVAR>=1 (flood coolant on)
N30
IF[#3002LT#2*1000]GOTO30 (wait for coolant on time)
#<FCVAR>=0 (coolant off)
GOTO10
I can get the variable for the flood coolant from the machine ladder later in the week.
Any help is greatly appreciated! :D
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October 17, 2018, 2:37 am
Hi, I'm trying to thread m12 x1.75 pitch with a taegutec non fully formed insert (if that's the correct way to say it) but because its not fully form when my stock is turned to 11.834mm the last pass of the threading insert at X9.834 then forms the material up, in turn making the OD 12.50mmish. I was thinking could I turn the stock diameter smaller to accommodate the material deforation to make it 11.834mm and is so how much??
LINK TO THREADING INSERT
TaeguTec Cutting Tools - Metal Working Tools - ER/L-6 : 5921931 - 16ERM AG 6
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October 17, 2018, 5:38 am
Hi, I recently built my own cartesian style CNC router with 12mm plywood parts. Its mostly an
OX style CNC with delrin wheels for linear motion on V-slots. I can mill 6061 aluminium on this but I see a lot of chatter. Here is a video where I'm milling a 5mm hole and as you can see there is a lot of vibration and an awful racket as the mill goes down the material (look at the mist nozzle. Why is this?
CAM was done in Fusion 360. This was a boring operation with a 0.1mm step pitch. Material thickness is 6.7mm. Feed was 260mm/min. The tool is a 4mm 2 flute end mill.
Could this probably be because of the delrin wheel based axes? Would replacing them with a linear shaft and blocks help? Perhaps I'm doing the wrong operation?
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October 17, 2018, 4:44 pm
For 6 months I've been lead programmer and operator for a glass company. We have 2 haas vf4ss and 2 mini mills. Since I took over I have revamped the department with machine able vises, using their opm40 probes to their fullest rather than just an edgefinder like they have been. And I've reduced cycle times to the best of my ability by researching new tooling and program methods. I am in need of advice from someone with knowledge of the glass industry. I utilize "stepover methods" only .010 at a time at most. with 120 600 grit bits ranging from .020 dia to 1.5 inch diameter, some solid abrasive tools, core drills for plunging, ramping in, and helical entries either to get another tool to finish the profile with side cutting since I have not found bits for glass that will cut downward as well as side or stepover movements besides core drills but those are limited to their small cutting depths and their need for cleaning and dressing too often. For milling and edge grinding borofloat, fused silica, flashed opal, b270 and Uv filters I've been using these diamond grit end mills called CeraX endmills. I am in dire need of someone with experience with these materials as there isnt much on the web as far as advice on toolpaths, feeds and speeds (hands on learning) workholding is typically pine wax and ground aluminum bases, or vacuum which we are in need of reliable and modular vacuum fixtures , all we have are what weve made in shop. Which only work 50% of the time and being only one person with 4 machines I'd rather convince them to invest in products rather have me fashion them all. Does anyone have any recommendations regarding abrasive tooling with plunging and edging capabilities, workholding, and toolpath/ programming advice. any articles, Websites, forum posts. any and all info helps. Thanks for listening to my convoluted cry for help.
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October 17, 2018, 11:43 pm
I recently got a tree journeyman with dynapath system 10. The machine starts, and references, and jogs. I've yet to run a program but will soon, just sold my rpc to get a bigger one for this machine so waiting for that to get installed. Anyway the system 10 appears to be in good shape all the boards are clean, no known repairs.
I've also got a delta 20, that was on a tree 325, it is supposed to run but I have not tested it yet. It can drip feed programs so that's a plus. I've read that the delta systems were less prone to problems. It would take some work but I'm sure I can get it wired up. And have parts and smarts install the right program for the 310.
My question is what are other differences between the system 10, and delta 20. Do the both program the same. I know delta does conversational, Iso, and a form similar to gcode, I have a delta manual, but I'm not sure about system. Does the system 10 have other limitations.
What I'm trying to decide is should I just run the machine as is, or should I install the delta 20. The system and delta stuff is not compatible with each other, so one can't be spare parts for the other. So I'll sell the one I don't use
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October 18, 2018, 9:28 am
Hi Everyone,
We are deciding between those two machines for our next Swiss. Does anyone have any positive or negative input to share on either the machines or support available in the Chicagoland area? It looks like they have the same 32-iB control. We'll be doing quite a bit of milling with the live front cross tooling so if anyone knows if either one is more robust than the other that would be helpful, but I imagine each machine has it's foibles so I am mostly concerned with the after-the-sale support...THAT one's a biggie.
Thank you!
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October 18, 2018, 11:50 am
How do I open the carousel door and keep it open so i can clean the tool slots? The carousel has a lot of chips built up in it but i cannot figure out how to keep the door open on it so i can blow all the chips out and get a good cleaning in there.
anything helps!
DD
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