Here is a list of all the postings tractionengine42 has made in our forums. Click on a thread name to jump to the thread.
|Thread: The domestication of Laser Cutters|
There's some very good videos concerning Chinese laser engravers/cutters on this channel, very comprehensive and informative, well worth a look.
Edited By tractionengine42 on 05/09/2017 12:26:49
|Thread: Polishing on a bench grinder?|
I believe you can use most bench grinders, you need to select pigtails that match the grinder shaft dia, usually 1/2" on small grinders and mop diameter/width that match the grinder power rating.
You can find recommendations for mop sizes relative to the grinder power rating here. I've no connection other than being a customer.
|Thread: Making a small profile tool.|
You could make a steel shank and silver solder a piece of 2.5mm HSS or carbide drill shank to it. If your going deeper than 1.25mm then grind some side clearance.
Some HSS drills do have a soft shank though, so a good quality drill will be needed. The temperature of silver soldering HSS won't effect the HSS hardness much.
As illustrated below.
|Thread: CNC controller problem|
The electrical noise problem appears to be solved!
I had been running everything from the same socket via a multi point extension cable. After plugging the motor controller into a separate socket (still on the ring same ring main) everything is working fine. just spend an hour doing engraving with the high speed head and no problems at all.
So today is a good day and very happy with my new CNC mill build, fingers crossed trouble free running continues.
I will still make improvements by adding suppression filters etc. to be on the safe side.
So the lesson is don't run VFD's etc from the same electrical socket as sensitive electronic equipment. Allot of lessons learnt here about electrical noise and suppression.
Thanks again for your thoughts and suggestions.
Thanks again for your help and suggestions.
David - I have the standard (low speed) head and a high speed head, both ramp up and down on stop and start.
Martin - My control system is close to the motor so this may not have been a good idea. The photo below shows the set up for both low and high speed spindles. The cable to the high speed motor is shielded but not to the low speed motor.
I have ordered suppression filters and shielded USB cable.
Originally I ran the high speed motor a few times off the machine away from the control box with no problems but that seems to have been luck.
The current situation is that the UC300 almost always disconnects when either the high speed head or low speed head starts otherwise it will disconnect when the motor stops.
I tried starting the UC300 and Mach 3 with the motors already running, the system ran g code for a short while then the UC300 disconnected. On a couple of occasions the UC300 disconnected with the system running idle (no motors or gcode running).
I removed the UC300 from the control box and placed it 4 feet away from the motors (which meant running a long DB25 cable (shielded) between the UC300 and breakout board in the control box. The results were exactly the same, the UC300 disconnected when the motors start and/or stop. This being the case I'm not sure moving the whole control unit away from the mill will help.
As Said I am waiting for some suppression filters and shielded USB cables to arrive. Adding a powered USB hub has been suggested to remove any possible USB power supply problems.
I think I could spend my hours and GBP chasing my tail, I'm wondering if I should ditch the (expensive) UC300 and just use the computer printer port (I did this before when converting a Sherline mill to CNC and rarely had any problems). The other option is to go with the dedicated cnc controllers now available where no marrying of computers, software and controllers is necessary, I do like Mach 3 though.
Again any thoughts or suggestions appreciated.
Thanks Gents for your thoughts and ideas, I have very little electrical knowledge so suggestions are a great help.
The problem occurs only and precisely when I stop and start the motor which at present I am doing manually, not via Mach 3.
OK, as a first attempt to solve the problem I will use a separate independent power supply to the UC300 controller. I also like the idea of adding a snubber across the relay contacts. (I did wonder if it would be worth changing the stop/start relay for a solid state device, this could be a bit of a challenge for me though).
I like the idea of including a USB opto isolator, but as these seem quite expensive I will try the above first. As it will do no harm and is of low cost I will also add an EMI filter to the motor controller supply and use a shielded USB cable.
BTW, I have a separate high speed head using a different motor and motor controller. I've just been trying this one out and so far have had no issues. So that's encouraging.
Much appreciated, I will let you know how I get on.
Edit - BTW the drivers for the UC300 are up to date.
Edited By tractionengine42 on 21/04/2017 22:53:18
I've just finished my cnc convertion of a chinese mill which has a brushless motor/brushless motor controller.
I am using Mach 3 on Windows 7 and a UC300 USB motion controller.
Everything is OK apart from one thing. I've tested the mill a few times; most of the time when I switch on or off the brusheless motor I get a message that the connection with the "UC300 is not responding" The only way to restore the connection is to shut down the computer and reboot however, the computer will not shut down properly, the shut down screen appears then the computer has to be manually powered off.
I would appreciate any ideas as to what steps I can take to put this right.
Could the problem be noise from the relay conatcts making and breaking on motor stop and start? If so can this be fixed?
Could an EMI filter inline with the bruchless motor controller solve the problem? Should I be using an EMI filer for each piece of equipment i.e. computer, Stepper motor & drivers PSU and Mill bruchless motor?
Should I shield the USB cable going from the computer to the smooth stepper?
Anything else I could consider?
It's very frustrating because apart from this problem everything is working great. It's only when the motor stop and start is pressed the problem occurs.
Thanks for any help.
Edited By tractionengine42 on 21/04/2017 20:13:58
|Thread: Allchin Differential Lubrication|
I don't think squirting oil though the annular gap mentioned would be very effective in getting the oil where it's needed. Chain saw oil is tacky, this could be used on assembly and should keep the surfaces wetted, then don't worry about it, re-lubricate once a year or so.
I will be using chainsaw oil on my main exposed drive gears, because it's tacky it shouldn't fling around to much or run off to quickly.
I've built the Allchin in 3 inch scale. When driving the differential gears only rotate against one another when cornering and the rotational speeds are very slow. With this in mind, right or wrong, this is what I did.
I made my gear pinions from steel, to provide a good bearing I lined them with a cast iron bush and used silver steel pins, I coated the pins in dry film moly disulphide lubricant. On reflection an oilite bush could have been a better choice.
I also coated the gear teeth in dry film moly disulphide lubricant so no grease or oil is used.
I have only recently finished the engine and won't be steaming until next spring, so at present i can't give any feed back on this method.
Hope this helps.
|Thread: Chamfer Milling|
I just use part of the radius of a ball nose end mil/slot drill of which I have several sizes. I just eyeball the cutter position to get what looks like a 45 deg chamfer of the required width. Although mostly I would just file it.
|Thread: Ball screw lubrication|
Nick, thanks for the additional information.
I'm thinking ISO 220 will be a good all round choice for the ball screws + vertical and horizontal slides using a one shot lubrication system.
I can keep most of the lubrication pipework internal to the mill avoiding lots of external pipes, should be a neat solution. I have ordered the ARC one shot lubrication pump.
Thanks for all your very quick replies
That's clear cut then, I wiil include the ball screws within my one shot lubricating system so they will be lubricated along with tte slideways using ISO 68 oil. I may follow Nick's suggestion and use ISO 220 for everything.
Involute Curve - yes, I will be ordering the ARC lubricating system.
Edited By tractionengine42 on 17/07/2016 16:26:10
I'm converting a mill to CNC and using 16 dia X 5 pitch C7 rolled ball screws.
Any recommendations for ball screw lubrication?
A Google search does not give a conclusive answer, in general for hobby use it appears to come down to either use slideway oil iso 68 or general purpose lithium grease.
It appears moly or PTFE additives should be avoided as these friction reducing agents can cause the balls to slip or skid.
I am including a one shot lubricating system and I'm at the stage as to whether or not to include the ball screws, or alternatively, lubricate them separately using grease.
Any comment, experiences appreciated.
|Thread: dressing grinding stones|
I had the same problem using the straight cup grinding wheel that was supplied with the kit, it's not normal and suggests the wheel is not suitable for HSS. My guess is the wheel is more suited to carbon steel tools.
I got a recommended wheel from a local supplier which worked significantly better, unfortunately I don't have the wheel spec and now use diamond wheels on my T & C grinder.
It's worth contacting a supplier for a recommendation, this link may help is selecting a suitable wheel. Look under cutter grinding/HSS.
Edited By tractionengine42 on 27/06/2016 09:19:57
|Thread: The Workshop Progress Thread (2016)|
Here is another website to consider. Don't forget customs will charge the 20% vat plus a handling fee.
Often the ends of Rebar is bent as a requirement of the final structure so needs some ductility and therefore presumably will have some impact strength.
Edited By tractionengine42 on 18/02/2016 17:04:05
|Thread: Boring Bars.|
Yes, Dorian tools Inc
Clearly there are various types of carbide boring bars and recommendations from various manufacturers.
Of course these recommendations are relative to an industrial setting where production rate and tool performance are paramount. Maybe not so relevant in a home workshop however, the OP does report some observed benefits of his set up thus it's worth consideration.
|Thread: Warco BH600G Modifications (clutch, gears, 3 phase)|
Regarding the gear train noise I fitted 2 timing belts as shown in the photo below. With this arrangement rotation of the Banjo to disengage the gears from the spindle drive allows engagement of the timing belts and vise versa. The intermediate gears are also moved along the banjo slot to dis-engage with the final driven gear.
I use the time belts for normal feed, for screw cutting it's a quick changeover to engage the gears and dis-engage the timing belts.
I did this mod 10 years ago and it's worked without any problem.
Additionaly the time belt is arranged to give finer feeds as compared to using the gears.
For the carriage lock I used an indexable lever.
|Thread: Workshop flooring|
I have my Elliott Omnimill standing on polypropylene interlocking tiles without any problems although I do have a sheet of 12 mm ply between the machine and floor.
That said it would definitely be preferable to stand the machines on the concrete, especislly the lathe which will require some levelling adjustment when being set up.
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