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Member postings for DiogenesII

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

Thread: 7 1/4 BR Brake Van Drawings Wanted
09/06/2020 19:42:23

A Mr "Terry White 4" added a posting (his first) asking for help locating drawings for a 7 1/4 BR Brake Van on the "Tangential Tool" thread, so I have taken the liberty of starting a new thread here in the hope that his request might reach a wider audience..

"Terry W, Hi all,Im trying to locate drawings for a 71/4 gauge BR Brake Van,can any one out there help?"

Terry, hopefully the title will catch your eye, if you see this please leave a reply below then any members who can help will be able to advise or message you.. Welcome to the forum, and good luck with your search.

Mods, hope this is okay, feel free to do with this whatever seems right to you..

Thread: Tangential Tool Holder
08/06/2020 22:56:08

Bah - 9 humid hours of clipping Buxus Sempervirens, followed by the infuriating agony of "Microsoft Photos" mysteriously re-materialising on my PC and sending two years worth of pictures that MS didn't know I had back to Silicon Valley, presumably to be inspected for any identifiable brand logos and the faces of people who might be on my contact list.. Wish you joy with that..

So where were we? ..I used Niels' method of turning a cylinder of known radius and a feeler gauge to establish that the surface of the Hobbymat slide is 10.07mm (THAT much wear, eh?..) below centre-height - milling the toolholder to this height, so that the point of the toolbit can now be set by turning the holder upside-down on a flat surface..

I think I will accept Niels' challenge and make a dedicated holder to fit the Myford - I'm sure that I will not win a straight race, but maybe I can cheat, or think of an even more outlandish set-up.

I really need to get some new toolbits ordered - the small HSS drill-shanks are coming to an end, and because most have been used/chewed, I notice that although the overall surface finish is okay, using magnification shows that "Edison Phonograph Cylinder" effect.. Stoning, testing & stoning "old" 2mm rounds is one of those things that life may be too short to be doing much of.. I'll have to sell my television or something, and buy a 2 x 100mm stick of carbide. And a quality pin vice, maybe..

How and what do you sharpen your toolbits on, Niels?..

What a day..

 

Edited By DiogenesII on 08/06/2020 22:58:57

08/06/2020 08:30:30

..parting a slot - now that is scary! ..I'll stick with a slitting saw..

08/06/2020 08:24:49

Good morning,

I had some success measuring and milling yesterday, and some failure with surface finish.. ..unfortunately, the tedious responsibility of "work" intrudes today, I will post some photo's and a fuller text this eveningface 24.

Thread: The Workshop Progress Thread 2020
08/06/2020 08:00:07

That Thompson really is an interesting little engine - I can see why you'd want to model it. I'd guess that economy was the main driver of the design, but there's something very pleasing about it.

Nice, Look forward to seeing it come together.

Thread: Tangential Tool Holder
07/06/2020 09:37:20
Posted by Niels Abildgaard on 07/06/2020 08:28:16:

Hello DiogenesII

The way to machine the cheeks can be seen here

Old pictures

I have never been very at ease with slitting saws and You just use one a little more than a mm thick?

What is Your centerline distance from compound slide top?

Edited By Niels Abildgaard on 07/06/2020 09:20:26

Enviably logical! ..I wish I had that clarity of vision in the workshop.. A job for this afternoon..

07/06/2020 09:17:46

Ha, I am being overtaken by posting events! Niels, to respond to your old post - it is gratifying to see that your CAD images are more or less identical to the holder as I have it - I made the nose angle 85 degree, but will make it narrower on the next one. I have filed it for easement and now need to experiment to see how tightly I can approach from the side.

Howard, I find that the 2mm bit (as I currently have it ground and held) is limited to a useable cutting depth up to about 0.25 mm - adequate for the Hobbymat, but I think there are probably better choices for bulk stock removal - it is possible Niels can achieve better, not least because he has spent far longer in refining his design, and has a more solid platform from which to work.

It strikes me that CAD may hold the definitive answers on cutting depth, which will surely be tied to the logical mathematics of an acutely-sectioned cylinder?

As to setting, in practice, I find that because the cutting edge is plane and somewhat reflective that orientation is easily established by eye and intuition, although being plane, it ought to of course respond to the attentions of a small but easily constructed setting jig.. Another thing to get round to!

Slitting saws - I think I must have started to use them whilst I was unaware of the dangers, and so they do not cause me any concern - use a speed at the lower end of the required m/m, feed by hand gently until the teeth are fully engaged in the slot and thern you can up the feed rate just a little to keep it cutting cleanly - maybe you know that "hissing" kind of noise when steel is cutting nicely - like that, and like all sawing, best results by not pushing too hard, just each tooth cutting off a nice chip.

For a small job, I'd rather go slow and not use oil, than use oil and have the chips turn to a sticky mush in the slot, better to keep them free to exit. Never use CT90!

The centre height is about 10.5 above the slide, but accurately measuring is first job of the morning!

Sincere thanks for your advice so far

07/06/2020 08:10:56

Good morning

For my own part, I have experimented with round tool-bits in the past, and have found 3mm or 1/8" is probably about the useful limit on the small machines I have (I have a tired ML7 as well) if chatter is to be avoided.

Niels, to cut the slot takes a keen eye, and a steady hand - and a .050" slitting saw - I considered hand sawing, but like you, I find it leaves a finish that is not good for public viewing. No-one will ever see pictures of my mandrel handle!

06/06/2020 21:23:49

Many thanks, both;

Howard - your information is a useful reality check, and confirms my thoughts on the necessary angles - the toolbit is ground at c. 24 degrees and inclined at 12, so I feel some reassurance there. For the current "testing of the principle", I've been using a "clog-heel" type clamp so that I can quickly swing the tool between the necessary orientations required for "turning" and "facing" - I do recall the "inclined-base" version, and will refresh my memory again, thank you for the prompt. I agree regarding the utility of a centre-height gauge, which I already have, and indeed, dovetails neatly into the observations of...

Niels - very canny, the holder will be going under the mill tomorrow and will emerge 2.2mm or so thinner along it's back.. I will not have to fish in oily swarf for the tiny hex key ever again..

Are you able to both side & face with it in one position? .."sharpening" the angle of the nose, without thinning down the clamp "jaws" is becoming the most head-scratchingest part of the job.

I'd like to see more of your build if possible..

06/06/2020 20:17:37

Hi, thanks old mart, I hadn't considered making it a double ended, but that's a logical plan for a test bed.. It'll also be convenient 'cos as you can see in the second photo, it was the last end of the bar..

06/06/2020 19:53:31

In a recent update to an ongoing thread (Lathe Improvements?), Niels Abildgaard included a photo of a machining setup which featured a short, stubby tangential toolholder which barely overhung the edge of the topslide - The design commended itself to me as a Hobbymat owner, as I've always regarded the standard toolholding provision to be, well, less than perfect, perhaps.. The Hobbymat does not respond well to excessive or uneven loads applied to the surface of the topslide, and the tools must be shimmed to centre height - the opportunity to try and alleviate some of these admittedly minor annoyances and to be able to employ a simple and easily set tool for the most commonly undertaken, facing and turning tasks seemed to be worth an experiment.

I quite shamelessly set out to produce a smaller but more-or-less identical version of this toolholder with the aim of trialling it, guessing at the angles (12 degrees for toolbit and back rake, 85 included at the nose) from extra photo's that Niels kindly posted.

The initial results are promising - the holder was relatively simple to make, cuts well (when arranged not to rub - see below) and sits firmly on the topslide without having to apply brutal levels of torque to the clamp. It's currently fitted with a 2mm round HSS toolbit.

The tool as it currently exists is very much a "first-off" and I throw it out here, naked in it's imperfections, for scrutiny or comment by anyone interested.

I'd welcome opinion on whether the 12 degree toolbit angle is in the right ballpark or whether it could usefully be increased to provide more clearance without increasing the risk of weakening the edge - and will I need to change it if I wished to use carbide?

There is a "To Do" list - I clearly need to reduce the height of the upper face/front chamfer to avoid the nose rubbing, reduce the included angle of the nose to provide more side clearance, and experiment with tool-grinding angles to find the optimum balance between cutting angle and edge-strength. And I may move the clamp screw rearward just a little..

Any comments and suggestions will be gratefully received

img_1028.jpg

img_1030.jpg

img_1137.jpg

 

Edited By DiogenesII on 06/06/2020 19:55:27

Thread: stuck chuck again
06/06/2020 08:15:03

'pologies if this is teaching granny etc., but I find that even the slightest failing to ensure that the chuck is run completely onto it's seat before starting invariably leads to it sticking..

Has anyone ever used (or considered) a LH-threaded nut on the end of a mandrel inserted through the chuck to hold a spindle whilst loosening a chuck?

Thread: Slitting saw applications: limited?
04/06/2020 06:41:49

..or clamp to a small angle plate (imagine something like IanT's table mounted vertically on the mill..). ..or even mill up a piece from the scrapbox to make a holding fixture, if it's something you do often.. ..something like a block with a rebate in it, and a finger clamp..

Edited By DiogenesII on 04/06/2020 06:43:36

Thread: Belt Up
02/06/2020 17:20:33

As mentioned above, one can simply machine opposing shallow tapers - 2 degrees will do it - and blend using a file.

This tracks fine with 6" pulleys at 2850rpm, and the tracking adjustment is capable of putting the edge of the belt exactly on line with the edge of the platen (and keeping it there) if needed. Both of the wheels have a shallow 2 degree crown.

img_1108.jpg

Thread: What Did You Do Today 2020
27/05/2020 21:16:47

..sounds like Glandular Fever to me..

Thread: DIY Electric welder
22/05/2020 07:24:05

Has the potential for a great Class Action, maybe?

(Much as I admire the pioneering spirit of exploration, appreciate the hard work of the poster, and am a grateful recipient of that knowledge... etc.)..

Edited By DiogenesII on 22/05/2020 07:28:32

Thread: mystery tool
22/05/2020 06:40:37

..holders for (maybe the circular-type) thread form tool?

Thread: KMyford Hard Rubber Bushes
20/05/2020 20:03:46

..no-one's that keen to rush out and measure those filthy things, then..

The overall width is 5/16", the flange is 3/32" thick. The major diameter across the flange is 1 1/2", stepping down to 1 1/4" for the reduced portion that the slots in the cover ride on.

The bore is approx 1.10" (can it really be 1 & 7/64ths? -seems a ridiculous dimension to choose..), in any case, just make them to be a good push fit onto their spigots, and the reduced part to have a little clearance in the slots so that the bushes stay fixed on the countershaft head and the cover is able to slide up & over them easily..

Welcome to the forum!

Thread: Lead size for metric bolts.
19/05/2020 07:31:23

Hi Mel. ..all the commonly available threaded rod and fasteners use Metric Coarse Pitch as the standard issue, unless stated to be otherwise;

Wikipedia ISO Metric Screw Thread

..M10 will give you 6mm in 4 turns, but getting a convenient number of turns-at-hand-wheel for 8mm spaces from the M8/10/12 coarse sizes might be a pain - if this is important, 1mm pitch Fine thread bar is available in larger diameters as illustrated here (although I'm sure other suppliers also stock it).

GWR Fasteners Metric Fine Threaded Bar

..depends on how much handle-turning you find acceptable!

Edited By DiogenesII on 19/05/2020 07:40:20

Edited By DiogenesII on 19/05/2020 07:41:44

Thread: Sharpening Files
13/05/2020 09:11:18

I have done it, with the aim of removing rust from a job-lot of ancient new and used files - they sat in a quart of vinegar for up to two weeks (checked at intervals).. ..the "new-but-rusty ones cleaned up okay and are good. Those that were new but pitted, worn, or marred in any way weren't any better.

Once the "edge" has gone, any erosion just seems to replicate the profile as is at the time of dunking, or perhaps even to make it worse - I guess it's in the very nature of the process to remove the angularities and thinnest parts first.

Some of the "new" files were a bit pitted and "raggy" here and there, and they are truly awful to use - they "pin" horribly.. they went in the scrap box (suddenly, and with great emphasis) during the last job that involved EN3b..

So no, it didn't work for me, other than to remove rust.

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