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Member postings for Norman Willcox

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

Thread: French Model Engineer
29/04/2011 11:11:10
Thank you all for your useful replies and information.
I have filed the suppliers addresses.
Norman
Thread: Diamond tool holder.
25/04/2011 14:16:52
Hi NJH, Jomac and Les Jones1,
Thank you for your replies.
Search as I might yesterday I could not find the download of MEW 156 page 12. Sorry if I am being a dim forum user.
I have found Jomac's description and I will absorb it but I have only a MIG welder, which seems to be failing in power, and I have been forbidden to use it because of my pacemaker - advice I have ignored several times, safely so far. I am sure that I could not achieve the required joint though.
I viewed the pictures by Les Jones and this is a bit similar to the one I have made. I found someone else's pictures yesterday, showing the double angle set-up on the milling machine to make the slot at 12 degrees in two directions. I cannot find them today!!! I tried to copy this design, though I put the bolts in from the tail-stock side. This fellow bolted his holder directly to the cross-slide but I can't do that.
I think I may be able to make my prototype work by cutting off the head and bolting it on the underside of a steel section to be held in the toolpost, thus dropping it.
I would like to see the MEW version.
Why can't I find these recent posts on this thread?
Norman
 

25/04/2011 11:12:39
Has anyone got some sketches of successful home-made Tangential cutting tool holders please?
I have just made a simple prototype but there is insufficient clearance to the centre. I can't mount directly on the cross slide on my Harrison 9"
Norman
Thread: French Model Engineer
25/04/2011 11:05:39
Hi Bob,
Did you find the magazine. Did you rate it?
Does it advertise suppliers of materials? I have great difficulty finding easy-cutting steel and almost any other materials in small quantities here.
I resort to College Engineering Supplies in UK.
Norman
Thread: Cutting speed theory
23/04/2011 14:45:00
I am grateful to all those who have responded to this thread.
Cutting/cooling fluids have been mentioned including 5-56, which seems to be a similar product to WD40? I hope I am not departing too far from the thread in asking for more info on these fluids. I have looked at a previous fluid thread which did not cover this aspect.
We have had an issue with Chronos MT5 because it stained the machine just hours after use. Presumably the staining was the start of some sort of corrosion. My son spoke to Mark at Chronos, who had not come across the problem before, and they spoke to the supplier at Caldo oils to no effect. MT5 apparently has both Chlorine and "Active Sulphur" as ingredients.
Master Chemicals trim OE335 is free from both Chlorine and Sulphur and may be a better choice?
CRC 5-56 may also be a good choice though it is not advertised as a cutting fluid.
We intended keeping clear of "Soluble" oils because of the anaerobic corrosion likely in some places on the machine. Use of the machine will be intensive sometimes but gapped.
The use of any of these will presumably strip the machine oil/grease, necessitating replacement.
I would be glad of any advice.
Norman

23/04/2011 13:51:58
Hi mgj,
D'accord!
I was a bit quick with the translation the full one I used came from wikipedia.
 
“Felix, qui potuit rerum cognoscere causas” is verse 490 of the "Georgics" (29 BC), by the latin poet Vergil (70 - 19 BC). It is literally translated as: “Fortunate who was able of things to know the causes”. Vergil may have had in mind the Roman philosopher Lucretius, of the Epicurean school.
23/04/2011 10:16:36
Rerum cognoscere causas.
 
Fortunate who was able of things to know the causes”.
 
Thank goodness for Google!
Norman
Thread: Face cutter cutting width
22/04/2011 22:30:58
Hi Gray and Nigel,
Thank you both.
I have ordered the Norton stone.
Norman
22/04/2011 20:54:16
Hi Gray,
I have usually just used the grinding wheel to sharpen the HSS tools.
I have googled slip stones and looked at Axminster tools without seeing what I think I need. Most seem to offer stones for woodworking gouges. Do you have a particular supplier and description please?
22/04/2011 14:37:47
Hi Nigel and Gray,
Thanks for your posts.
Is the 1/64" radius ground on the outer tip of the cutter?
Norman
Thread: Cutting speed theory
22/04/2011 08:38:25
Jens Eirik Skogstad,
Thank you.
I already have Sparey's book, and I have found it very useful.
I have had a clapped out, originally treadle driven, Britannia Colchester lathe for 52 years (Currently disassembled and due for the scrap yard) , and it was replaced by a second hand Harrison 9" lathe 3 years ago. So although I don't do a great deal of turning I am more experienced with the lathe than with the rather cheap Chinese XJ9525 vertical milling machine that I bought new 2 years ago. (This machine has not proved reliable).
It is the mill which demands more knowledge of cutting speeds and feed rates to achieve satisfactory results. I am working through Harold Hall's "Milling - a complete course"
Norman
 
21/04/2011 17:14:43
Hello Ramon, Clive, Sam,Jens Eirik and Ian,
Thank you so much for all the information and advice.
My son and I understand a lot more than we did. We shall be a lot better in selecting speed and rate.
Thank you,
Norman
Thread: Face cutter cutting width
21/04/2011 16:59:12
Thank you Graham, Clive and mgj for your responses. I am more confident now and no doubt a better finish will be possible.
Norman
21/04/2011 09:34:31
Hi mgj,
The alloy is 6082-T6. Supposed to be good for machining.
Norman

Thread: Cutting speed theory
20/04/2011 22:52:48
Hi Ramon,
I take the toughness point.
Aluminium is known as having difficulties with cutting - stuff builds up on the tool etc. It is soft enough to to be deformed in front of the tool. I wondered if hitting it hard and fast reduced the possibility of it being deformed rather than cut - a sort of inertia effect?
I also read somewhere that heating increases with cutting speed and the reduces again with further increase - don't know if this is relevant to ali though.
With the wood analogy - a hard fast blow with an axe often produces a cleaner cut?
Is the dependency on the cutter material more because of its capability to withstand the heat and its hardness so that it can maintain its edge?
 
Norman
Thread: Face cutter cutting width
20/04/2011 22:35:47
No, I did see that there is another grade for aluminium. These are IN30M - whatever that means!
Cuting lubricant is Cronos MT5.
1200rpm, 250mm/min feed, 0.25mm depth, almost full 32mm width.
Is full width wise? that is up and down milling at the same time, isn't it?
Norman

20/04/2011 18:51:28
We have been using an Ingersol face cutter of 32mm diameter with 4 "multi-cut" inserts. Finish on the aluminium alloy is not very good.
Is it permissible to set the width of cut to the full 32mm or is it better to use less than 1/2 the width?
Norman
Thread: Cutting speed theory
20/04/2011 18:42:59
I would like to know why Aluminium alloys have higher cutting speeds shown in the tables.
Is it because a faster speed cuts rather than tears the metal?
Is it because cutting Aluminium does not cause so much heating?
Is it just that the aluminium is soft so that more material can be shifted easily?
I cannot find anything useful on Google!
Norman
Thread: XJ9250 Milling machine
25/03/2011 23:24:16
XJ9250 from SPG Hinckley Ltd
Has anyone any information on this machine please?
My machine stripped the brass motor pinion, which drives a steel gearwheel, in the first few months and it stripped the lead-screw nut on the Y motion soon after. I made a new bush for the lead-screw nut on the lathe.
Backlash on all motions was not impressive from new.
I have always suspected the RPM and today measured it with a tacho-generator. It is 600/1750 instead of the advertised 1000/3000. That is not enough for milling Free Cutting Steel with a 3mm endmill.
Does anyone know of a supplier of replacement steel pinions?
Is it possible to adjust the electronic controller to increase the speed?
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