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Member postings for ega

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

Thread: inside an induction hob
02/11/2018 15:06:15

"touch controls no longer worked - seems to be a common issue"

That's what did for my microwave oven and at least one remote controller (although the latter can be fixed).

Thread: Myford S7 George Thomas rear tool post, RTP
02/11/2018 14:11:03

Ray Pope:

Just picked up your PM without problem and have PMd back. If you still don't receive my PM I suggest you tell me via this thread.

Thread: Beautiful QCTP
02/11/2018 11:34:56

For me, the errors often don't appear until I have the printed copy in my hand.

Mike Poole:

I had overlooked the likelihood of the spell checker being involved - surpassed only in destructive potential by predictive text!

Thread: Myford S7 George Thomas rear tool post, RTP
02/11/2018 11:00:17

Zan:

Good point about getting the tapers to match although I don't think it occurred to me when I made mine (or to GHT?).

I agree that the reamer is relatively straightforward to make but the OP clearly did not want to do so.

My objection to the majority of inserted tip tools is the overhang. That said, I am pleased with the ISCAR tangential parting tool I have on the other lathe; it is mounted in a GHT style RTP.

Ray Pope:

Still hoping to hear from you.

Thread: Beautiful QCTP
02/11/2018 10:15:18

An advertiser in MEW is offering an "Adonis Q/C toolpost"; users do find their QCTPs very attractive but perhaps this goes too far.

Have others had their ads mangled in similar ways and did they still manage to sell?

Thread: Dial Gauge Advice
01/11/2018 11:05:43

Michael Gilligan:

Thank you. The answer seems to be in the last paragraph of the patent (which I assume has now expired).

I suppose another "proof" of a sort would be to compare the readings from the same setup using both spherical and pear-shaped styli.

Thread: Myford S7 George Thomas rear tool post, RTP
01/11/2018 10:02:16

Ray Pope:

Bumping your thread as it looks as though you may not have read my PM.

If you no longer want to borrow the tooling I will return it to store.

Thread: Gargoyle Velocite oil.
01/11/2018 09:52:35

Bill York:

"The heads on the M75 and the T90 lathe were interchangeable." Seems like an excellent idea. I recall that the Dore-Westbury mill had a Myford spindle nose.

SOD:

Great stuff! Machine tool manufacturers blithely specified a specific brand of oil ignoring the possibility that the oil industry might move on; they would have done better to provide the specification (no doubt some do).

Thread: Dial Gauge Advice
01/11/2018 09:38:17
Posted by Michael Gilligan on 01/11/2018 08:49:00:

Posted by Michael Gilligan on 31/10/2018 18:09:04:

... it's worth noting that the "pear-shaped" tip, supplied by Verdict, confers much better linearity than the common ball-ended probe.

.

blush Just noticed that ega had already mentioned this on page1 blush

I was glad to get confirmation of this point and, having followed up your helpful link, I see that I should have said eliminate rather than mitigate ie Verdict claim accuracy within the angular limit given. Their diagram is rather small and they don't give the underlying maths; I was hoping that some of our more scientific members - you, perhaps - would weigh in with the proof.

Andrew Johnston:

I have just installed a pear-shaped collet tray on the lathe; so far it hasn't gone belly up!

Thread: Gargoyle Velocite oil.
31/10/2018 20:59:54
Posted by Bill York on 31/10/2018 10:00:55:
Posted by Jon Lawes on 31/10/2018 09:56:09:
So what is the machine?

Hey Jon,it is a Mikron F75 milling machine, I have put some pics up in my albums if you want to check it out, these are before pics and I will be uploading rafters soon.

Nice-looking machine and interesting that the spindle nose appears to be similar to that on the Mikron lathe the subject of another thread.

I assume Gargoyle was a foreign company?

Thread: Slitting Saw Arbor
31/10/2018 18:47:02
Posted by Rik Shaw on 31/10/2018 17:22:13:

... the buttock clenching fright at the end of a cut when"that" occurs.

The remedy when slitting into a bore would be to fit the bore with a temporary, tight-fitting plug.

Thread: permaglide bushes
31/10/2018 14:09:00

Some may remember Derek Beck's First Affaire with a Lathe series in ME in which he described building a milling spindle using (from memory) "Glacier DU" bearings. As I recall, when he was running in the bearings tiny fragments of PTFE were released.

Thread: Slitting Saw Arbor
31/10/2018 13:57:19

I don't think anyone mentioned the phenomenon of the work closing on the saw towards the end of the cut; I understand this is due to the release of stress within the material and in my experience can be strong enough to arrest the saw. On the occasions when this happened I was using a shop-made arbor without a key and with RH nut and RH rotation.

I now have an MT3 arbor with LH nut which casts doubt on the Myford theory.

Thread: Dial Gauge Advice
31/10/2018 10:48:10

I think Verdict claimed that their pear-shaped probe mitigated the error.

I agree that the DTI is more likely to be useful to the ME.

Thread: Taper turning
30/10/2018 14:21:44
Posted by Pete Rimmer on 30/10/2018 11:18:01:

Yes that's exactly the idea. It was a one-off setup for cutting one particular internal taper angle in a hardened shaft using PCD tooling.

Love that cross-slide idea.

I forgot to say that the adjuster was subsequently modified to work also with the standard top slide.

The PCD tooling sounds very useful.

30/10/2018 11:05:47

Pete Rimmer:

Was it this kind of thing you had in mind?

b0010136.jpg

The adjuster screws can be seen bearing on the "topslide" base (it is actually a cross slide adopted for its extra length in boring a taper in work supported by bush-type steady).

Thread: Boring heads
28/10/2018 23:10:51

PS I meant to say pilotless *hole saws* (and the one in question was actually 70mm diameter.

28/10/2018 18:01:02
Posted by Alan Waddington 2 on 25/10/2018 08:36:07:
Posted by ega on 24/10/2018 23:46:07:
Posted by not done it yet on 24/10/2018 22:01:25:

Apart from the fact that the Rotabroach type of cutter has flutes for chip clearance it has the added advantage that it cuts closer to size and, further, a pilot is not necessary so that the resultant slug has no central hole.

A pilot isn’t necessary with a hole saw either, if mounted in a drill press or mill, infact you can even use them freehand without the pilot drill if you use some form of jig to centre.

Thanks for the tip about pilotless centre drills. I tried this today with a 74mm hole saw on some 3mm plastics sheet; undemanding material but I was impressed by the ease of the operation.

Thread: Myford S7 George Thomas rear tool post, RTP
28/10/2018 17:44:21
Posted by Clive Brown 1 on 28/10/2018 17:10:50:

Afraid mine don't seem to be around any longer, but If no-one has them to lend out, and provided you have access to a lathe, the required cutters are quite simple to make from silver steel, hardened afterwards. GHT described them in his original ME articles.

The 12 deg reamer is basically a tapered D-bit, the 7 deg. cutter has 2 flutes formed with an end-mill.

The drawing in GHT's Manual does indeed show two flutes formed by an end mill; looking at mine now I see I opted for three flutes possibly having in mind Len Mason's suggestion that odd numbers seem to work better. For milling slots GHT recommended slot drills over end mills for the reasons given in the same work.

28/10/2018 17:11:30

Ray Pope:

I will send you a personal message; look out for your Inbox button (second from left at top of page) to start flashing.

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