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Member postings for John Baron

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

Thread: Countersink choices
30/01/2019 11:17:30
Posted by pgk pgk on 30/01/2019 10:39:22:
Posted by Douglas Johnston on 30/01/2019 09:53:02:

I find the Weldon style zero flute type tend to be more forgiving than other types and cut very cleanly when sharp. Not so easy to sharpen though where the cutting face is formed by an angled hole through the cone shape.

Doug

I've not had need to sharpen mine yet but always planned to spin it up in a cordless drill and offer it up against the belt sander?
 

 

pgk

Don't do that, you will quickly ruin it !

Weldon single hole countersinks have a tapered cone ! You can see it if you use a pointer aligned with the edge of the cone and rotate the countersink. There is about 20 thou of taper on them.

 

 

Edited By John Baron on 30/01/2019 11:18:07

Thread: Hemingway Knurling Tool
09/12/2018 12:17:07

Hi Mark,

I would have glued both pieces together and put them in the four jaw on the lathe, drilled to remove the waste and then bored both holes to size.

However its an interesting technique that you have used. I'm watching with interest.

Thread: Flycutters: help to understand 3 different types
09/12/2018 12:07:32

Hi BW,

Very good effort !

First thing I noticed from your first picture, you have far too much tool stick out. Rigidity is the thing here. I also notice that you have the spindle secured with two nuts. Whilst its hard to see on the picture of mine there is no spindle below the bottom of the disc. The spindle on mine was pressed into a bored hole, and I also used superglue to make sure that it did not move. Whilst not absolutely required, I also faced off the underside whilst holding the spindle in the lathe chuck.

I did a lot of playing about with tool bit shapes. The rounded edge seen protruding through the disc is the one that I use for alloys. There is only about five or six degrees of rake and the front face is virtually flat.

The toolbit for cutting steel is quite hooked. I basically copied my lathe tools.

Last thing ! Check your mill tram. Under ideal conditions you don't want the cutter taking more off on one side, this is most noticeable on a long cut when cutting in one direction and the cutter is taking a shave off at the other side.

07/12/2018 19:30:48
Posted by not done it yet on 07/12/2018 12:57:13:
Posted by John Baron on 07/12/2018 12:09:38:

... The really hard part was making sure that both the male and female parts fitted together properly. ....

Well done, but isn’t that what Gib keys were invented for? One side could be made as a straight edge if the key was retained in the other plane. An infinite number of attempts could then be made to make the key at just the right shape.smiley

I agree ! But at the time I had only recently got the mill, so it was very much an exercise to see if I could make one. I've had a Myford S7 for a long time, so making a suitable fly cutter was the easy part.

07/12/2018 12:09:38

I agree ! All sorts of things can be cut with a flycutter.

This is a couple of pictures of a dovetail slide that I made that way. The really hard part was making sure that both the male and female parts fitted together properly.

I admit that I did cheat a little. After making the male half, I took a slice off the end and used it as a template when making the female half. They are a nice fit and slide together well.

26-01-2018018.jpg

26-01-2018019.jpg

The brass screw on the left of the top picture is for locking the slide.

The screw on the bottom picture drives the two parts.

 

Edited By John Baron on 07/12/2018 12:10:44

06/12/2018 19:17:23

Hi BW,

All the fly cutters seen in this thread will work ! The only one that I would not use is the boring head.

The primary requirements are rigidity, and balance ! Out of balance forces cause various issues, vibration being the least desirable. A fly cutter has to be able to encompass the work area or you have to make multiple passes. Clearance, you don't want to collide with any protruding obstacle, hence the angled cutter type.

new_flycutter-1.jpg

This is one of mine. 3" inches in diameter, 20 mm thick, 20 mm spindle. A heavy rigid body and spindle. Well balanced, and a good flywheel effect. Particularly important if making interrupted cuts. I can take a 1 mm DOC in mild steel at a 150-200 rpm. The tool bit in this one is 5/16" square HSS.

 

Edited By John Baron on 06/12/2018 19:19:27

Thread: Arduino DRO
29/11/2018 16:58:54

Hi Guys,

FWIW every HP inkjet printer has an linear optical positioning system that is easy to get at and provides directional information. The reader head, whilst different in size to say a slot opto, is very similar electrically. Without checking the technical data sheet for the optical reader head I don't know how fine the steps are, certainly the tape is at least 200 lines to the inch.

Thread: ML7 Quick change suggestions
23/11/2018 20:20:25

Why not make one ? The Norman Patent tool post is a good project !

25-09-2018-006.jpg

This is mine, sized for the Myford lathe.

Thread: Cutting a keyway without a broach
11/11/2018 09:50:21

Hi BW,

Why don't you try it !

I'll guarantee that you can't pull it out by hand !

That retaining method has been around for a great number of years ! One of its uses is to retain two round shafts that are not in perfect alignment and provide drive from one to the other. You can find examples of this in some of the old radios of the 20's and 30's. I do believe that its used in some rotary tools today.

Thread: Myford ml7 tools size
10/11/2018 20:08:29

Hi Tom,

If you have the ability, make a "Norman" patent tool post ! I made one for my Myford S7 and can use from 1/4"  inch up to 1/2" inch square tool size. Most of the work building one is turning and threading. I posted a picture of mine a short while ago. I also have the drawings based on the original patent by Van Norman.

Its one of those things that I wish I had made years ago. In fact Myford actually produced and sold the ML3 and I believe ML4 lathes with one already fitted.

Forgot to add I use HSS tool bits,  the Myford doesn't really have enough speed for making best use of carbide.

Regards:

BaronJ.

 

Edited By John Baron on 10/11/2018 20:11:43

Edited By John Baron on 10/11/2018 20:12:32

Thread: Cutting a keyway without a broach
10/11/2018 19:55:50

Hello Mike,

Yes I published mine in 2010, so that would have been just before you're article. The similarity prompted my reply to the post. Since I didn't even know that you're web site existed.

I recall that the method of retaining the toolbit caused some interest at the time !

It seems that great minds think alike. I'll have to go and have a wander around and see what else you have done

Regards:

BaronJ.

10/11/2018 16:55:57
Posted by Michael Cox 1 on 08/11/2018 21:59:27:

Here is an easily made adjustable broach:

http://mikesworkshop.weebly.com/small-hole-slotting-tool.html

I would suggest that you remove most of the material by drilling or milling first and then use the adjustable broach to clean up the slot.

|Mike

That tool is based on the one that I published on another forum some years ago

25.06.2010-003.jpg25.06.2010-004.jpg

One of the things that makes it unique, is the method I used of retaining the cutter.

Thread: inside an induction hob
02/11/2018 15:05:39

I agree ! Why pay them money to make more money from your scrap !

There are a lot of very nice and useful components in a lot of the stuff that we have to pay to get rid of. The local scrapyard will gladly take this stuff of your hands for free, simply to survive.

The last lot of electronics scrap I took to the scrappy, I got £250 for 1/2 a ton. Mainly computer PCB's.

Thread: Myford Super 7 Serial Number Missing
27/10/2018 18:16:29

Hi Guys,

It could be one of the Taiwanese clone Myfords, or just the bed and rebuilt.

Thread: Myford QCTP Recommendations
25/10/2018 17:41:55

Hi Michael,

I hadn't noticed the spelling error !

Thanks for pointing it out !

Thread: Power feed for a mill.
25/10/2018 10:03:14

Hi Guys,

I made a mill table drive using a salvaged car window wiper motor. It can easily be powered from an old computer PSU. Using the gearing that I used, at 7 to 8 volts it takes about 2 amps.

mill-table-drive.jpg

The white knob pulls back to allow direction changes with a neutral position in the middle. It is a simple dog in a slot mechanism. The wiper motor is dual speed, not that its needed since I actually use a variable voltage PSU and can crank up the voltage to 30 for fast traverse if I need to.

Thread: Myford QCTP Recommendations
25/10/2018 09:35:16
Posted by Neil Wyatt on 24/10/2018 20:35:10:

Hey don't spoil the Normal Toolholder article in the next MEW

Neil

Might pay you to drop me a copy of the article then !

I have a complete set of drawings based on the original patent. Though I have published my design in a number of places.

24/10/2018 19:55:13

Hi Guys,

I've just made a "Norman patent toolholder for my Myford S7B. I should have done this years ago.

25-09-2018-006.jpg25-09-2018-007.jpg

No modifications to the lathe, just removing the old tool holder and replacing it with a 38 mm diameter post. I also made a new nut to get rid of the ball handle.

Thread: Bench grinder improvement mod.
07/10/2018 17:36:44

Hi Guys,

That tiny lip becomes an issue with the cheap nasty monkey metal flanges that seem to get supplied with most grinders nowadays. A good close fitting washer works wonders, extending the bore of the washer is even better !

Better still is facing the washer square actually on the grinder shaft.

Don't forget to use blotters on each side of the wheel.

Thread: More Scam from the Scum?
07/10/2018 17:28:02

Don't get taken in by this crap ! This scam has been doing the rounds for a little while.

But just in case a bit of tape over your camera and mic will solve any issues with being recorded and videoed.

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