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Member postings for Phil P

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

Thread: Portable vice - buying advice sought
29/04/2021 11:23:52

+1 for the Record Imp's

I have a larger 4½" one on a swivel base, and a couple of the smaller approx 2½" ones.

One of the smaller ones has its serrated jaws still, and the other one has some smooth steel jaws.
My main bench vice has solid aluminium jaws, I never have the need for the serrated ones for the work I do.

Phil

Thread: Eueka! - Has music been redefined?
27/04/2021 15:46:15

Nice job on the Eureka by the way.

Phil

27/04/2021 15:35:03

Eureka Formentlastungsgerät

According to Google Translator smiley

Thread: Press fit sizing
24/04/2021 22:18:18

Oilite bushes are designed to fit a H7 tolerance reamed hole. There are various standards available but the H7 is the most common.

Phil

Thread: Material for coupling rods
19/04/2021 22:24:58

Or if you have an open hearth fire in your living room, you can chuck a few lengths of BDMS in before you go to bed and then leave it to cool slowly overnight and it should be nicely stress relieved in the morning.

Phil

Thread: Covid
18/04/2021 12:03:30

Myself and the wfe have now both had two AZ jabs which were five weeks apart.

I had no after effects whatsoever, but the first one put my wife's heart into AF for a couple of days which was frightening as she had an operation to cure the AF a couple of years ago and was worried it might not go away again.

It went back to normal after about 48 hours, on the second dose she just felt a few flu like symptoms for about half a day.

We were lucky to get our second jab a bit earlier, she rang the doctor about something unrelated and just mentioned about a second jab and they booked us in for the following week with no bother at all.

Actually thinking about it I went very sleepy when sitting watching telly, but I blamed the Gin for that smiley

Phil

Edited By Phil P on 18/04/2021 12:04:53

Thread: All the gear, no idea
07/04/2021 07:01:34

Do you know if there is model engineering club nearby, if there is then one of the members may be able to call and advise you.

Phil

Thread: Milling machines - western-made s/h recommendations up to Ł2k
05/04/2021 20:39:42

If that Centec 2B advert above is genuine and not an April Fools joke, then £650 sounds to be a real bargain.

Phil

Thread: Steel Rule Graduations Re-Blacking
04/04/2021 11:41:41

I use a black "Sharpie" pen, and rub the unwanted overspill away with a fine garryflex block.

Phil

Thread: Home made screws
02/04/2021 18:29:36

Hi Steve

You were correct, the blank size was the problem.
I made a fresh attempt using 0.053" (1.35mm) as you suggested and it worked a treat even on a long thread.

It also gave me a chance to try out the ultra slow speed inverter setting I rigged up on my Pultra 1770, I can run a thread up to a shoulder under power and then reverse it off again, I am really pleased with the results.
I just need to set up the capstan attachment now and go into mass production, but that is another story.

Thanks for giving me the advice to carry on, I had all but given up on the roller box but it works very well.

Phil

02/04/2021 12:06:11
Posted by Steve Crow on 02/04/2021 10:06:13:

I have just been experimenting with those thread rolling dies with very little success.

Any advice would be welcome.

Phil

Hi Phil, maybe the problem lies in the diameter of the blank you are threading.

The theoretical diameter for thread rolling is the pitch diameter of the thread. This makes sense if you think about it as the tool deforms equal amounts of material in and out.

Pitch diameters :- M1.2 =1.038, M1.4 =1.205 and M1.6 =1.373.

In practice the blank should be slightly less. I've only tried the M1.2 die and I turned down the screws to 1.02mm. It works fine on 1mm rod as well.

For M1.6, I'd give 1.35mm a try.

The rollers don't revolve. The alignment of the wheels forms the thread. Did you get a little threaded rod with each tool? When assembling the tool after a breakage, this is used to ensure the rollers are in the correct alignment when tightening everything up. If you can screw this in and out easily, everything is in the right place.

I hope this is helpful, let me know how you get on.

Steve

Hi Steve

Yes I did get the test piece with each one, and it does screw in easily, I actually measured the remaining bit of plain section on it to find the blank diameter and it seemed to be 1.4 mm so that is what I tested it at.

I will have another play and see if 1.35 mm works out any better, I could not see how it would work with the rollers revolving as they are not retained on the shafts, so it has to be down to the blank diameter I suppose.

Do you use any lubricant on it when forming the thread ?

Phil

PS, Just so others know what we are on about, here is a link to one.

Thread-Rolling-Head-Die-M-1-6x0-35 202976842528

 

Edited By Phil P on 02/04/2021 12:19:32

01/04/2021 18:28:25

Steve

I have just been experimenting with those thread rolling dies with very little success.
I have 1.2 1.4 and 1.6 sizes, I tried the 1.6 first and it just necks the raw material off and the roller box has to be dismantled to remove the broken end, mine was mild steel not silver steel though.

Do you know if the three "rollers are meant to revolve or do they just form a thread as they push forward, mine do not revolve and the friction is just too great for the material to hold up against the twisting force.

I am making longer studs rather than headed screws.

Any advice would be welcome.

Phil

Thread: Multi-dimensioned Drawings
01/04/2021 11:59:17

That looks to be very bad practice to me, very confusing and open to mistakes.

Normally you would assign each dimension a letter, and then tabulate them in a chart on the drawing for each alternative size.

Phil

Thread: gun with trigger for bead blasting cabinet
31/03/2021 23:14:56

Dave

You are spot on with your comments regarding air to the pickup.

The operation of the gun relies on the fact that a vacuum is generated in the gun body and it is that vacuum which draws media up the hose and entrains it out through the nozzle.
But unless the correct ratio of air and media is travelling up the hose it will never perform correctly, most people tend to have an over rich mixture and that causes the gun to pulse, the media never gets up to full speed and the performance drops off, if the mixture is too lean it will probably be exiting the nozzle with enough velocity, but there will not be enough of it to be very effective. It is a fine balancing act to get it just right.

At the point where a Guyson pickup fits, it can be adjusted in and out of a mixer box which sets the mixture to the correct ratio, it will need re-adjusting if the media type changes significantly. glass bead performs very differently to say a steel shot or other heavy media.

The condition of the actual media being used also has a great bearing on the performance of a blast cabinet as well.

Phil

31/03/2021 22:05:22

I am afraid there is no substitute for more air capacity, most blast guns will only give mediocre results if you are trying to use a small compressor that cannot keep up with it.

The comment about the Guyson 400 not being any good is a bit unfair, that gun performs extremely well if it is set up correctly and has an appropriate air supply. The design goes back many decades and despite many attempts to come up with a better design over the years, it still remains one of the core products for Guyson's. In fact many people buy a Guyson gun to upgrade other makes of blast cabinet.

Phil

Thread: Honda 125 electrics
28/03/2021 19:14:22

I run a 1972 Honda XL250, the electrics are very marginal on that as well, the bike runs perfectly until the headlamp is on then it starts to misfire at high revs.

I never got to the bottom of it and dont understand why it should do that as the lighting and ignition coils are separate units and should not affect each other.

I tried an LED bulb in my headlamp, but the rectifier must be not giving a very clean DC output and the LED lasted a matter of minutes.

I solved the problem by never going out in the dark on mine smiley

I am with the others on this, run the engine and see how it performs before you change anything else.

Phil

Edited By Phil P on 28/03/2021 19:15:22

Thread: A new job
28/03/2021 12:25:15

I dont know why, but when you said Vroom Vroom Vroom, I immediately thought of our vacuum cleaner smiley

Phil

Thread: Finish for wooden base
23/03/2021 08:57:13

Has anyone tried Sikkens Cetol Filter 7 Plus on model engine woodwork yet.

My Morris traveller wood is finished with it and it is excellent stuff, it allows the wood to breathe without any flaking off like you get with normal varnish, it also leaves a dry surface that does not attract dust as Danish oil can be prone to.

Phil

Thread: 5 BA Cap screws
21/03/2021 11:25:31

Could you use slotted cheese head screws instead ?

EKP do them
https://www.ekpsupplies.com/5ba-x-3/4-steel-ch/hd-qty-100.html

Phil

20/03/2021 22:13:17

Dont know about 5BA, but could you use M3 instead they will be pretty close and readily available.

Phil

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