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Member postings for Martin Connelly

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

Thread: ER 32 Collet Tightening Torque.
29/09/2020 20:56:34

Conflation

Martin C

29/09/2020 11:42:19

This is nothing to do with fasteners and all to do with driving the collet up into the taper of the holder with enough force to compress it sufficiently onto the shaft of the item in the collet. A compressive load not a tensile load.

Martin C

Thread: Milling cutter advise
28/09/2020 20:10:13

You could see what Arc Eurotrade have o start with, they advertise on this site and have plenty of people on this forum who have praised their service.

Martin C

Thread: ER 32 Collet Tightening Torque.
28/09/2020 19:57:35

This is what I use for ER32 nuts. I recommend avoiding any wrench that is hard on the hands such as combination or double ended. Keep the collet and tool oil free but have a fine smear of oil on the inside taper of the holder and use ball bearing nuts.

img_20200614_093452.jpg

Martin C

Thread: fly cutter wear
25/09/2020 11:00:34

This is my example of HSS fly cutting on steel, about 55mm diameter at 166rpm, 0.1mm depth of cut. As Neil says low speed, low feed. The temptation to go too fast is always there.

 
Martin C

Edited By Martin Connelly on 25/09/2020 11:13:40

Thread: Aircraft General Discussion
20/09/2020 15:14:18

I saw the BBMF 80th anniversary flight heading back to Coningsby this afternoon after their flypast in London. They must have done a few other flypasts on the way back for me to see them. I am not near a line drawn from London to Coningsby.

Martin C

Thread: Stuart 10V Build Log - Complete Beginner...
19/09/2020 20:26:12

I think a few home made machine jacks would be of use to you. Nothing fancy, just a cylinder of some suitable material tapped through and a bolt with a smoothed off head. It will allow a far more substantial support and can be used with some top clamping to do jobs like the one where the work piece is supported by a small drill.

Martin C

13/09/2020 09:19:44

A good reason to keep pieces of broken tools is to use as material for home ground grooving tools. A damaged milling cutter of reasonable size can often be ground to leave give a 1mm (or less) wide grooving tool, they usually don't need to stick out much. The other option is to have some HSS blanks of different sizes handy to grind into a suitable tool. Making a suitable holder is also a simple exercise.

Here's an earlier thread on this subject

Martin C

Link added

Edited By Martin Connelly on 13/09/2020 09:21:44

Thread: Left Hand Milling Cutter
10/09/2020 09:05:54

Suitably ground hss or gauge plate in a fly cutter running in reverse. You are not limited to a long sweeping arm.

img_20200910_090007.jpg

Martin C

09/09/2020 18:01:54

Fly cutter running backwards with a suitably ground HSS tool in it.

Martin C

Thread: Stuart 10V Build Log - Complete Beginner...
05/09/2020 19:06:11

Brass spacer under the oilers maybe?

Martin C

Thread: Using a gear to index a chuck
04/09/2020 18:29:33

Joe Pie has an interesting video on the subject of dividing. Probably not suited to your current needs but worth a look.

Joe Pieczynski ​​​​indexing tips

Martin C

Edited By Martin Connelly on 04/09/2020 18:31:16

04/09/2020 17:49:01

Harold Hall has one on his website. Look at his metalworking index, dividing project.

Martin C

Thread: Flycutting on the speed 10
02/09/2020 17:32:46

Hi Jon, I suggest you google mandrill and mandrel. You will understand why your post sounds like animal crueltywink

Martin C

Thread: Laptop power supplies
24/08/2020 00:22:07

Sounds like what happens when the battery has lost power due to not charging. It is usually preceded by the memory being backed up to disk but if you don't notice this happening it will look like a sudden shut down. Since you know that the external power supply is dodgy this would be my first guess.

Martin C

Thread: Ring rollers - anything known?
22/08/2020 11:17:20

Probably a badly translated specification regarding inside diameter, outside diameter and centre line diameter. In reality what can be achieved depends on material spring back and physical size together with the size of the rollers and their relative positions. These given values will change if the rollers are replaced with something of different size. Does it come with interchangeable tolling to suit different material sections? If so the given sizes may be minimums for two different sets of tooling. Here are some rolls I made for aluminium tube.

img_20171118_133557.jpg

Martin C

Thread: Plain lathe gearing for 'bastard' metric thread
21/08/2020 08:45:21

Little John manual

This is the link to the manual mentioned above. I have looked through it and it seems to have a typical back gear arrangement that has no bearing on screwcutting pitch. It does state that there is a permanent 2:1 reduction ratio from the spindle giving an effective tpi of 16 to the leadscrew.

Martin C

Thread: 6" Stainless Steel Pipe
19/08/2020 17:43:07

Flanges? Third post from the top!

Martin C

Thread: Dead Center's
18/08/2020 19:00:59

Two new tapers, one old socket? Check the socket.

Martin C

Thread: Unidentified collet
17/08/2020 10:32:17

I noticed the odd slots as well. I decided (possibly erroneously) that the partial slot in the first picture went all the way down and that the two full slots from the bore to the outside did not go all the way down to the bottom of the collet.

Martin C

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