Recent Posts

Pages: [1] 2 3 ... 10
1
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on May 10, 2021, 04:23:26 AM »
It occurred to me that if I were to loose the X=0 Y=0 setting on the machine that determine the centre of the circle for those bolt holes it wouldn't be easy to re-establish it - unlikely as the machine control maintains them, but better safe than sorry so I need a feature that I can get the probe at (as the plate edges are too close to limits for the probe to work)

So this mornings fill in job while waiting for the postman was a nice and simple task - bore a 25 mm hole 20 mm deep accurately on the centre as previously established

Apart from checking that the loaded 22 mm slot drill WAS centre cutting, and that it's Z offset was correct - dead easy. So now if we have a power glitch etc I can get back to where we are now. Probably always sensible to incorporate some such feature in a part - even a spoil board !
2
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on May 09, 2021, 10:58:41 AM »
I managed to get a little more done this afternoon between tasks.

The spoil plate needs a circle of eight M10 x 1.5 mm holes drilled and tapped to marry up with the matching circle of 15 mm holes in the billet clamp flange. So a bit of transferring co-ordinates from the flange drawing, specifying an 8.5 mm drill and M10 spiral flute tap in the tool crib, then actually mounting them and measuring their Z off sets before . . . Pressing the button  :bugeye:

It's always a bit bottom clenching waiting for the machine to smash your tools to shreds and ruin your work up to date, but no - it all worked without dramas and the billet clamping flange is loosely mounted.

The M10 hold down bolts are in 15 mm holes in the flange which I hope gives me sufficient wiggle room to get things aligned when I have to invert the billet having machined one side - time only will tell !

I may cut another machinable wax as a test before doing the EN19T billet - haven't decided yet

. . . back on duty now . . .
3
New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on May 09, 2021, 06:57:40 AM »
At long last I've been able to get a bit of time to return to this project. Life (or rather death) had got in the way. Sadly one of my long term flat tenants died suddenly leaving rather a mess to sort out, shame as he was a nice chap and very reliable (but his next of kin is in Panama!) and another problem tenant left again leaving a horrible mess. It all takes time, and not an inconsiderable amount of dosh to sort out.

However today I did actually manage to knock up a little G code program to surface the 'spoil board' and then sort out the CNC mill to mount it and machine it. The material is some very gummy aluminium alloy that I can't seem to get a good surface on, but that's OK it isn't particularly critical so long as it is flat.

The spoil board at 300 x 330 mm is pretty much the largest object that I can mount and work on with a 50 mm face mill without running into the limits set on the machine. In deed to find the centre I would normally use the Heidenhain probe, picking up each edge, lie to it to say that it was circular, and use the centre as X=0 Y=0, but the probe can't go far enough past the edge to work, so it was an eyeball job!

I used my Mitee-Bit clamps to edge hold it as the machining had to run off all edges, but first I hand filed the 'nasties' that have accumulated over the years, removed the heavy Kurt vice, and had a detour / diversion mining in the swarf to rescue the Allen Key and Tee nut that I managed to drop in there :bang: This plate was a test sample I was given literally decades ago and it has at times had to live outside

No more  playtime as it's guest check out / check in time



4
Gallery / Re: Bowman Loco Cylinders.
« Last post by sbwhart on May 09, 2021, 02:38:36 AM »
Hi Stew!
 Still around. Not very productive, at the moment.
Waiting for the weather to sort itself out. And, allow me to, "get out there", again....

Hope all is well, with you and your's.

Hi Dave

We're all good thank you so far escaped covid, had a bit of a brush with Prostrate Cancer treatment seems to have worked so far. Been building a loco for the last four years nearly got it finished about 12 months work max should see it finished and steaming.

Hope you and yours are all good

Stew
5
Gallery / Re: Bowman Loco Cylinders.
« Last post by millwright on May 08, 2021, 04:57:49 PM »
Yes Dave, it does beat the alternative!!!! good luck with the operation.

john
6
Our Shop / Re: My week this week, my workshop videos!
« Last post by hermetic on May 08, 2021, 11:15:38 AM »
The big "use it or get rid" continues. The final clearout is nigh! an accumulation of may years of "that will be usefull" collecting is finally ended when I realise that it wasn't! To be fair, a lot of this is left over from our auction visiting days, when the auctioneer would look at us and offer us "something mechanical" for 50p or a pound! We did use or resell an enomous amount, this is just the dregs, and a lot of it has a date with the scrap man en route to a chinese melting pot! It will be back before you know it, or else maybe blocking a canal somewhere on its way back!
Phil, Raining again!East Yorkshire
7
Gallery / Re: Bowman Loco Cylinders.
« Last post by Stilldrillin on May 07, 2021, 02:47:11 PM »
Hi Stew!
 Still around. Not very productive, at the moment.
Waiting for the weather to sort itself out. And, allow me to, "get out there", again....

Hope all is well, with you and your's.
8
Gallery / Re: Bowman Loco Cylinders.
« Last post by sbwhart on May 07, 2021, 02:26:59 AM »
Morning Dave

Nice to here from you  :thumbup: :thumbup: :thumbup:

Stew
9
Gallery / Re: Bowman Loco Cylinders.
« Last post by Stilldrillin on May 06, 2021, 05:45:56 PM »
Thanks Andrew....
10
Gallery / Re: Bowman Loco Cylinders.
« Last post by awemawson on May 06, 2021, 03:46:14 PM »
Good luck David with the procedure.
Pages: [1] 2 3 ... 10