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Member postings for ronan walsh

Here is a list of all the postings ronan walsh has made in our forums. Click on a thread name to jump to the thread.

Thread: electrical question
03/10/2012 23:19:56

Thanks kwil , i did forget about the setting up part.

03/10/2012 23:01:37

I have a colchester master lathe which i run from a yaskawa vfd , it will run up to a 5 hp motor well and its a great bit of kit, recently i bought a tom senior milling machine and it is three phase 2hp.

Rather than buy a seperate vfd to run the mill is there any type of directional switch that i could use to switch the output from one machine to the other ? Not while the unit is powered up of course.

Thread: where will the next generation of engineers come from
25/09/2012 01:28:54
Posted by Trevor Wright on 24/09/2012 13:00:47:

We took on a CNC programmer/operator recently with 15 years experience in the trade - he cannot work a manual machine.........I kid you not.....

I am a skilled miller/fitter/turner according to my indentures, but my current company re-defined me as a skilled precision machinist - sorry, but don't they work sewing machines?

As an apprentice there was no guarantee of a job at the end - there was - but there were 400 apprentices out of 2500 staff at any one time, could you see that happening now?

I am a fitter/turner/welder too and i have seen this "americanisation" of the trades creep in too , to me a machinist is a person who sews cloth on a sewing machine.

as too the whole subject of where the next generation of engineers and tradesmen will come from is a decision down to the uk government, it made me laugh to see a conservative prime minister give public addresses and talks in places such as the jcb manufacturing plant talking about apprenticeships and training for the young, ironic after another tory pm a few decades back couldn't wait to get rid of every last vestige of manufacturing abroad as the uk was going to be a "services and financial" based economy, ending 250 years of engineering tradition starting in coalbrookdale. a very sad sight.

but things look bright if the government supports engineering , after all honda in swindon has decided to double their vast car plant further.

Thread: Cylindrical Grinder Internal Attachment
12/09/2012 23:33:24

Is there not supposed to be a cover or guard over that belt ? Don't have the belt too tight or you will preload the bearings causing wear, have you put any dressing on the belt to stop it slipping squealing ?

Thread: 4" parallels
29/08/2012 23:08:49

I just bought a nice abwood vice for my milling machine, the jaws are 4" wide but any parallels sets i have seen are 6" wide , does anyone know who supplies 4" parallels ?

Thread: Dormer fastloc collets
25/08/2012 00:41:02

thank you michael.

23/08/2012 17:22:27

Does anyone happen to know if clarkson collets fit dormer fastloc collet chucks ? I ask as i have a dormer chuck and only one collet , they appear very similar to clarkson ones but i don't have a clarkson one to compare it to.

Thread: Chipmaster Refurbishment Questions
17/08/2012 12:59:59

You should join the yahoo colchester group and ask on there , very helpful when i was stuck for various work-arounds for my master.

Thread: Turning Phosphor Bronze
16/08/2012 21:27:41

I was turning up some bushes for a bsa motorcycle gearbox yesterday ,a sharp hss tool walked through it easily, the drilling was the same , good and sharp but the fine swarf builds up and binds the drill bit in the hole so regular pecking to keep it clear.

Thread: Colchester student run out
14/08/2012 16:48:43

Is the machine sitting level and straight on the floor Eg no twist along the bed ? I have a colchester too and have looked into alignment, you can offset the tailstock left and right for taper turning and maybe this has been done and not returned to centre ? A test bar with morse taper to suit your tailstock are available for you to check alignment.

on my lathe (a master 2500) the headstock is also moveable left and right , if a length of 1" ground steel bar is held in the four jaw chuck and clocked up central , a dti can be held in the tool post and run along the length of the bar to test for misalignment.

Just a few ideas , i am sure there will be more experienced people along who will explain this better and better ideas than myself.

Thread: Frame Problem
14/08/2012 11:39:51

Upol acid etch from halfrauds ?

Thread: Larger steam stationary engine
11/08/2012 23:23:31

Are there plans available for that engine jasonb ? metric dimensioned would be great, does anyone publish them ?

i was thinking something like this 

http://hasbrouck.8m.com/eng5.htm

Edited By ronan walsh on 11/08/2012 23:31:20

11/08/2012 22:47:51

Its more the lathe i have which limits what i can turn, i have a colchester master 2500 and trying to turn anything less than about 10mm is a bit of a pain. As for the mill , no its still three phase as i believe the 3 phase motor is a smoother and a vfd is as cheap as a replacement motor and has far more features. The travel it has in the z-axis is a bit limited and i might make a spacer that sits under main column giving a bit more room.

i am open to any ideas as regards the engine design, but something maybe 12"-18" long would be good.

11/08/2012 19:15:04

Would anyone know of a larger sized stationary steam engine design that could be built from bar stock ? My machines are a bit too large for the very small designs that are commonly available , it needn't be a complicated design , something simple like a horizontal mill engine.

Thanks.

Thread: Restoring - Polishing levers, handwheels & slides etc
11/08/2012 18:58:50

I bought a tom senior mill a few weeks back , it had been lying up for about a year, had a fine coating of light rust on all exposed bare surfaces. I used coarse steel wool and jizer first , but found plastic pot scourers from tesco and the jizer to be far better at removing the rust and caked on dirt from the paint too.

these scourers are green come in packs of 5 or 6 and are cheap and effective.

Thread: table drive motor identification
04/08/2012 23:41:35

Thanks for the trouble everyone has gone to on this , I have successfully managed to delete the wiring that was no longer required and the contactor block, the wiring comes directly from the rail on the bottom of the board, into the 240v-24v transformer on the top of the board, the power (24v) then runs back down to the rail connections , i didn't have to touch the actual electronic pcb's at all thankfully.

It all works fine now and i am very happy not to have to fork out for a new motor or vfd.

One piece of the contactor is remaining , i didn't know if i should remove it or not , advise please. Its in the last couple of picture i have just uploaded.

04/08/2012 16:59:35

I finally got the power feed working , i have upped two photos showing how, one of the three lives ran from L3 to L on the connections at the bottom. i disconnected this and connected a single phase live to the L connection on the right (beige coloured block) the neutrals are common as are the earths so these were connected also. With power applied the motor worked but only after the contactor in the second last picture was pushed in manually.

The motor isn't that fast running , even with the rapid feed button held down , but hey it works and the limit switch mounted on the front of the table works perfectly too.

So if anyone can tell me how do i get around having to push in the contactor manually ? can i do away with this component completely ?

Thanks all .

03/08/2012 22:34:48

thanks les , i'll contact denfords for a wiring diagram, they do have some drawings because they bought tom senior's in the early 80's and i will also ask over on the yahoo group for senior millers.

03/08/2012 19:04:49

Thanks les, i should have said that this machine came from a community college and is covered in safety switches , one on nearly every door or hatch and a massive emergency stop foot operated button on the base. There is a lot of wiring from these switches to the board. I may remove them as they don't serve any real purpose.

if anyone can steer me on how to get this table motor running with the original buttons and controls i'd be very happy.

03/08/2012 18:18:51

Yes michael ,thats the one, can i simply connect the live and neutral single phase to this ? , there is a contactor block immediately below this which has three phases connected to it , can this be isolated ? Surely its for the main drive motor which is now not connected to this board as its connected to a vfd.

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