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Member postings for Spurry

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

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Thread: "An Accurate CNC 4th Axis"...?
28/04/2011 16:01:38
I have recently completed a DivisionMaster conversion of one of Arc's 6" rotary tables as per the gospel (and pictures of John S).
 
There have been references to light and heavy cuts. If rounding off, say a piece of MS 3/16" thick with an 8mm end mill what sort of depth of cut should the DM powered RT be able to cope with? It seems that this setup would not pull the skin off a rice pudding, but not sure if I am expecting too much.
 
TIA
 
Pete
Thread: Technical and engineering drawing.
18/04/2011 11:06:11
I would have thought that such an article would be of more widespread interest than the ones on CAD design in MEW. Whilst I have no criticism of those particular articles they would be of real use to the users of those specific programs.
 
I will read any article where I can actually learn something.
 
Pete
Thread: Tool box shadow foam
10/04/2011 14:15:12
I have bought that type of foam from :
 
 
Pete
Thread: Studs for QCTP Holders
05/03/2011 13:50:20
Or just buy dog-point SHC screws - they have an unthreaded parallel portion already. I got stainless ones off Ebay. Search for m8x20 dog
 
Pete
added search criteria

Edited By Spurry on 05/03/2011 13:56:26

Thread: Notes on CNC Milling of 316 Stainless Steel
14/02/2011 23:54:16
Andrew
 
Are your coated toolbits HSS or solid carbide?
 
Whenever I have tried to machine at recommended feeds and speeds, the toolbits end up broken, so I'm not the only one to suffer.
 
Take care of the wallet.
 
Pete
Thread: Metric or Imperial, Fractions or Decimals
20/01/2011 16:02:01
Posted by Roderick Jenkins on 20/01/2011 12:41:17:
Does any body have a feel for whether UK customers buy metric of imperial machines these days? If I get the chance I'll ask Warco at Ally Pally this weekend (can I mention that on this forum?).
I can only speak for myself, but I would never entertain a none metric machine.
You only have to look at a set of metric plans and compare to imperial ones. The metric ones are much simpler to read. For those brought up with imperial, they continue with what they know well, a human trait I suppose.
To asknewcomers to use imperial when they have only been taught metric, always seems rather pointless to me.
Pete
Thread: Knurling Tools
16/01/2011 14:26:22
I think that is a standard size. Cromwell certainly list them in coarse, medium and fine
 
 
(bottom right on page)
 
Pete
Thread: Rulers - my pet peeve
29/12/2010 11:15:46
 

Have to agree with John on this one. I hate those 1/2mm graduations, but find it easy to judge half a millimetre by eye.

 

If I understand the requirement correctly, I have two rules made by Moore & Wright, one is 150mm and the other 300mm. Bought both in my younger days when the value of the design was not appreciated....or else several would have been bought. So far, I have been unsuccessful in obtaining duplicates.

 

Pete

 

PS I was taught that a Ruler had extra bits on the ends, so that a line could be drawn 1 ft long and the pencil did not fall off the end. Whereas a Rule was for measuring accurately from one end, so the grads started there.

 

 

 

Edited By Spurry on 29/12/2010 11:17:16

Edited By Spurry on 29/12/2010 11:18:12

Thread: Comments on the Exhibition
23/12/2010 19:05:00
Posted by Geoff Sheppard on 23/12/2010 11:46:54:
I recall that one well-known model engineering trade exhibitor (no longer with us) used to put his prices up at exhibitions. His reasoning was that someone had to pay for the stand rental and it wasn't going to be him!
 
Well,  there's still at least one exponent of that business technique attending the shows. There is not usually a price list displayed which gives a clue.
 
Pete
Thread: Dial Gauge
28/10/2010 23:41:08
The gauge shown does look like the Screwfix one. They are selling the magnetic stand at special offer too - ref 51845 at £5.10 each. I just bought 4 to use for a suds guard on the mill.
 
Pete
Thread: Midlands Model Engineering Show at Warwick
22/10/2010 10:51:23
In years gone by, it was always traditional to go to the shows to 'grab a bargain'. Many of the traders used to have special show offers etc.
 
I was very disturbed to find a new phenomenon at Ally Pally - prices increased! The prices referred to were in comparison to the trader's Internet site. As there were no prices displayed on the stand, I have to admit to not adding two and two together at the time.
 
When I later questioned the trader about his charges, he trotted out the usual excuses - high cost of stand, electricity and so on.  I wonder how many others he caught.
 
Pete
Thread: Simpler the Better -what do you use?
20/10/2010 10:01:48
Just in case anyone reading through the replies thinks no-one gets on with TurboCad,.I do!  Started with the DOS version which was... err.... difficult. V2 for windows was the one I got to grips with. Now on v16.
 
Although it's a 3D package (so it looks complicated), I onlty draw in 2D to produce dxf's for my cnc machine.
 
Other than that, I would agree entirely with the comments of John S above.
 
A Tcaddie laddie - Pete
Thread: Hints and tips
16/10/2010 10:34:28
Bogs
 
More useful reading from your last links. Great stuff - thanks.
 
Regarding your greaser machine, have you seen this one?
 
I've used one for a few years to grease the bearings on R/c helicopters.
 
Pete
Thread: Bead/shot blasting.
10/09/2010 11:34:15
The glass beads are not so aggressive as sand. Sealey sell a range of reasonably priced cabinets. The expense is not the cabinet, but the compressor to feed it with air.
 
I may able to help out, if you are anywhere near St Albans.
 
Pete
Thread: Rotary table stops
17/08/2010 15:38:59
Peter G
 
My table is a Vertex, but has no central upstand. It's so long ago that I took it apart, I cannot remember the exact construction. There is a picture of it in my gallery .
 
I know I made an adapter with a 10mm central locator hole, the outside of which is a short length of Morse Taper. Is it possible to take a picture?  it's much easier to see a problem than read about one.
 
Pete
16/08/2010 23:42:09
Thanks Alan.
That could be useful as a stop location. (The start is not usually a problem) On the job I messed up, I was cutting 1" thick material plate to a semi circular shape. In order to prevent the groove normally caused by lingering with the cutter, I downfed the cutter by hand, locked the quill, and started winding the table all at once.
 
At the end it was difficult to coordimate the opposite actions, especially not being able to see the table markings.
 
I now have no excuses for making such an error again.
 
Pete
15/08/2010 23:48:35
Thanks for the idea John.
 
That could be a short term solution, whilst I gather some courage (and tools) to machine the table.
 
My first thought would be to use an M5/M6 caphead with a turned taper, or have you deliberately used a grub screw to restrict the amount of sideways pressure that could be exerted on the casting?
 
Thanks again
 
Pete
 
 
15/08/2010 18:28:10
Great stuff!!
 
Thanks again Ramon.
 
Pete
15/08/2010 13:16:24

Posted by Alan Gray 1 on 15/08/2010 00:13:20:>>

Continue to be impressed by Ramon's beautiful work. >>

 >>

 >>

You and I both.

 

Thanks for the tips Alan. That's very useful for machining flats. My particular problem is with machining radii and slightly overcooking the turning when continuously machining the curve.

 

Ramon - What sort of  size of T slot would you machine? I gues a minimum would be about 2mm deep at the top (bottom?) of the T, perhaps 3mm with a suitable tool. My parallel sided slot is  10mm wide x 9mm deep at present..

 

Thanks again

 

Pete

 >>

Edited By Spurry on 15/08/2010 13:19:12

14/08/2010 19:58:52
Thanks for those ideas Ramon. That's a proper job!
 
I'm a little apprehensive about mounting the 10" table on the lathe to cut the grooves. It sounds very scary to me. Radially drilling on the mill does not seem quite so onerous.
 
Those pictures show me what I ought to do.
 
Pete
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