Recent Posts

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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by Pete. on May 24, 2018, 12:23:02 PM »
Man that's what I call fall over in Doris' sty and coming up smelling of roses :D
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New from Old / Re: New Cylinder and Piston for TS350 Petrol Saw
« Last post by appletree on May 24, 2018, 11:19:47 AM »
Another thing to watch out for ,is the in tank fuel pick up its like a clunck fuel pick up as used in model aircraft. The tube is a specially moulded affair which is made of a very flexible neoprene/silicone type rubber over time and allow air to seep in.
Did you fit a new carb gasket/s these have port holes which connect the crankcase to the pumper carburettor. Lastly are the carb spindles badly worn, they often are on disc cutters because of the "grinding compound"


Phil
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Benedikt on May 24, 2018, 11:18:16 AM »
 :update:

Good evening,

I just wanted to post this small update since it might affect some of you too (especially those who are running a small company and have a public website).
EU GDPR laws are going into effect as of tomorrow. I made sure to change http://config.pandora-cnc.eu/ to hopefully comply with these rules (and I am thinking about taking down the rest of the site for either an undefined amount of time or until I can confirm that it passes these new laws). It's not commercial, but I since I can't tell if it does still apply, I have made sure to change it anyways. You may have to change your website too to avoid legal trouble and hefty fines.
I have removed any local storage functionality, removed the optional analytics that helped me improve the website from time to time and removed features like continuing editing or previewing the generated file. Configuration files can still be uploaded and edited online, but after submitting in some browsers, editing cannot be continued and the result can only be downloaded and previewed with a text editor. Sorry for all that!
I may, if there is demand, change the internal data flow to re-gain some of this functionality and to also provide you with a fully translated website.
Please don't hesitate to ask for more/missing functionality or for me to bring back anything that was lost in the latest update.
As many people, I have not much of a clue what these laws exactly require me to do and I am rather safe than sorry. I don't usually work much on websites, so this is not my area of expertise.

Best regards,
Benedikt
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Electronics & IC Programing / Re: Measuring current using hall-effect sensor
« Last post by eskoilola on May 24, 2018, 10:59:30 AM »
I am surprised that you got away without degausing the toroid.

Did you got a whole lot of noise from the output even without the toroid? Did it had chopper or auto-zero artefacts?

Pekka
Actually I did not get away. The mild steel was the only one that did not need to be degaussed but even that gave erratic results. The major factor was the earth magnetic field. When one has a gap in a toroid it immediately starts picking up unwanted magnetic fields. For this reason I had a calibration phase when all the 12 sensors figured out their zeroes. The best results were obtained by first cutting off the solar panels, then eating a nice dinner with the friend and after two hours or more just run the calibration. Degaussing was not an option as it totally removes any magnetism from the iron. Somehow the earth magnetism seemed to cumulate into the toroid... I was pretty overwhelmed with the behaviour until I realized that the orientation of the sensors had a lot to do on how they behaved. It did not become perfect. The measurement was reliable to 200mA. In this application it was good enough.
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Electronics & IC Programing / Re: Measuring current using hall-effect sensor
« Last post by eskoilola on May 24, 2018, 10:49:45 AM »
My Consew CSM1000 servo uses a hall effect sensor to control the speed.  It might be worth looking at.
In that application it is not nessecary to measure the current. t is sufficient to know whether the sensor is near some object or not. The speed is the of course a series of pulses that can be converted into speed by counting and dividing by time.
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on May 24, 2018, 10:29:24 AM »
I knew it was too much of a co-incidence. The chap flogging the Renishaw Probe used to operate this machine at Portsmouth University :clap: :clap:

Not only that - he still has manuals and training materials - negotiations ongoing . . . .
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New from Old / Re: New Cylinder and Piston for TS350 Petrol Saw
« Last post by awemawson on May 24, 2018, 10:08:25 AM »
So what was the result?

Well the compression is now very much improved as you would expect.

It starts much more easily

BUT it won't tick over and needs choke all the time  :bang:

I've set and tweaked the low running and high speed jets but I suspect carburettor diaphragm problems

So it looks like a carb re-build after all. Carb kit ordered - in fact I've ordered two as I may as well do the other saw while I'm at it - the kits are only 3.90 ! 
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New from Old / Re: New Cylinder and Piston for TS350 Petrol Saw
« Last post by John Rudd on May 24, 2018, 10:05:13 AM »
Hmmm...thought you might have had it finished, used and put away for next time, by now.... :coffee: :lol: :lol:

Ha, you were typing/posting as I wrote....

Nice job Andrew, I like this kinda job, where you identify whats needed, it duly arrives, and re-assembly begins and is completed with a successful out come......
For me, 9/10 times there's always a complication.... :doh: something else breaks, is lost or wrong part...
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New from Old / Re: New Cylinder and Piston for TS350 Petrol Saw
« Last post by awemawson on May 24, 2018, 10:02:42 AM »
It was pretty tricky getting the throttle and choke linkages to line up when the top cover was re-fitted but I got there in the end !
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New from Old / Re: New Cylinder and Piston for TS350 Petrol Saw
« Last post by awemawson on May 24, 2018, 09:59:15 AM »
New gaskets set arrived this morning by post - not bad - only ordered yesterday at 16:30  :thumbup:

So just a bit of 're-mantling' - only clever bits being gaping the rings and sloshing two stroke oil on the slidy bits before putting it all together. To gap the rings they need to be set in the bore exactly perpendicular - I do this by placing them in the bore then squaring them up with the piston. Supposed to be pre-gapped and indeed they were both 0.35 mm which is in spec

The gudgeon pin circlips supplied looked as though a 5 year old had been twisting wire, so I re-used the originals

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