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Member postings for mark mc

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

Thread: 53 tooth gear
14/11/2012 08:39:31

So this is the first time i have ever needed to cut a gear and its a 53 tooth one, i have a rotary table with dividing plates but no 53 plate. So i was thinking i have a mill with a dro that can do pcd's, so i could use this to make a 53 plate. Now here's my question my rt is 90/1 so after alot of reading i think i need 1turn and 37 holes ? does this sound right ? I have no engineering training at all apart from books ie workshop practice series. thanks

Thread: Workshop insurance and compresses gasses
10/11/2012 14:25:49

Not sure about where you are but here in ni we have to tell the fire brigade if you have acetylene gas in your workshop and tell the insurance tho there not bothered about other gases. Where not even supposed to keep acetylene in the shop if there is no one in there. That's the way it is at in my work too, Acetylene must be left outside at night/home time.

Thread: tool tip height
06/11/2012 13:32:52

so i did a little test to day to show what i mean. from left to right we have hss .5 below dc next on dc then indexable tips on dc and again .5 below dc

2012-11-06 10.44.09.jpg

the steel may well be to blame too, i'll invest in some en1 and try again

06/11/2012 08:31:30

Also i seen this over at model engine maker, very funny.


06/11/2012 08:28:49

Thanks chris i never knew about them tho they are quite far away from me and driving thro belfast makes me cringe, hate the place. Nobby i've been thinking of making a Tangential tool as i have some hss but am abit rubbish at shaping the angles but i think i can easy make the tool holder and the tools are just ground at a 45. so I'm going to make one and give it a try, i'm not to bad with the mill but the lathe is getting the better of me. Also chris you say the tips where abit rubbish and to be honest I'm thinking you maybe right. Anyway off to the workshop/mancave to try out yor tips thanks again everyone for the help.

Edited By mark mc on 06/11/2012 08:29:26

05/11/2012 22:19:20

Thanks all for the replies, at first i thought it was to much over hang movement in the tool as well so i made a riser block and removed the compound slide this helped abit. I'm based in northern ireland so finding a machinist to watch is a problem. they don't seem to exist here any more!. I'm using glanze tipped tools so they should be ok?

The steel I'm using is old stuff from my work which has been turned before, old shafts from large bins usually 60mm dia by about 5 feet long. the shafts wear out brake, bearing goes so they replace them tho i'm not sure what type of steel it is.

I'll try the gibs and see what happens and try and get a few pictures up to you see what i mean.

Again thanks all

05/11/2012 16:10:46

thanks jason, guess i'm just going to have to experiment abit more

05/11/2012 09:26:34

Hi all, so being new to lathe work i get the feeling i'm missing something. The problem being if i set my tool tip at dead centre height so it removes to pip while facing, the finish i get is terrible. cutter seems to just bounce and dig in alot but if i set the cutter down say 0.5/0.75mm i get a nice clean cut but then i end up with a pip. Where am i going wrong? lathe is a comet vs with c-tipped tools tho i have tried hss and get the same results. Help!

Edited By mark mc on 05/11/2012 09:26:58

Thread: which milling machine
04/11/2012 09:07:49

It really depends on what size/materials your going to be working with. I got a chester lux a few months ago, a square collum mill/drill. Let me tell you i was surprised when the lorry turned up to deliver it, it's bigger and heavier than you might think. Anyway a tractor and linkbox and a few chains later it was on its steel frame. And as magpie says don't forget tooling/collets clamps etc as you probably spend as much again on bits n bobs. The main thing to remember is you can always do small stuff on a big mill but your buggered with big stuff on a small mill

Thread: Design a covering mechanism
03/11/2012 19:00:25

I don't think curtains/soft covers are the way to go, a guy at my work place fell from the top platform at the headboard while rolling back the top cover on a walkingfloor last week.A few days in hospital followed. And then add in wind, there a death trap.

Thread: ER32, ER25 or Direct R8 collets ?
20/10/2012 05:41:41

I would use the er32 setup as you can use metric collets to hold imperial cutters, so less collets needed

Thread: bending 4mm copper tubing
13/08/2012 13:38:16

I've heard of people filling the pipe with water and freezing it then bend

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