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Member postings for not done it yet

Here is a list of all the postings not done it yet has made in our forums. Click on a thread name to jump to the thread.

Thread: Mini Lathe Ways Lapping
30/06/2023 15:49:46

I always lock down the carriage when parting off, so it is not very likely to be lifting during that operation?

Thread: Static or electrical problem with lathe
29/06/2023 17:27:21

2 mm of exposed brass screw which of course is a terminal of the fuse holder

Is that a satisfactory arrangement? An accessible live conductor at mains voltage?

Thread: material choice
28/06/2023 19:37:08
Posted by SillyOldDuffer on 28/06/2023 15:45:47:

Stainless 304 wouldn't be my first choice. Mainly because it work-hardens, requiring sharp-tools that are kept cutting by the operator at all times. Rubbing a tool on 304 hardens the steel and blunts the tool pronto.

Cutting work-hardening stainless isn't horrifically difficult, but it's risky enough that I avoid 304. Also, stainless is unlikely to be cheaper than mild-steel.

Bear in mind too that the existing thin bendy handle may be deliberate. It's because vice handles are usually sized to bend just before the vice breaks...

Dave

Generally, the handle is made to a suitable length, such that the vise cannot be over-strained. It is often a length of pipe that causes damage. This is not a large vise, if the handle is going to be only about 30cm long.

Handle ends can be added by plug welding, screwed/bolted on with loctite thread sealant, shrink fitted, or any other means to hand.

Edited By not done it yet on 28/06/2023 19:37:55

Thread: Broaching
28/06/2023 19:14:19

I make my guides/inserts. If the slot is too deep, I add a suitable packing piece/shim - even before the first cut.

Most of my recent keyways have been cut on the shaper, but in the past I have only bought the broach I needed.

Making a guide is not rocket science machining. Shims likewise.

Edited By not done it yet on 28/06/2023 19:14:42

Thread: Small Milling Machines
28/06/2023 09:33:04
Posted by Grant Fisher on 27/06/2023 21:47:00:

I have a Boxford lathe with 3phase motor. I believe an inverter on some electronic device can be purchased that allows the motor to run on a single phase set up and some devices include a speed control. What makes are available , what is the likely cost of such a device and how easy are they to fit.

Look up VFD. Loads on ebay and specialist suppliers. Cost depends a lot on quality - cheap ones may be cheap for good reason (conducted/radiated interference issues, reliability, even safety). Easy to fit if the instructions are followed closely, but depends on the fitter’s ability/skill, of course.

28/06/2023 09:25:38
Posted by Grant Fisher on 27/06/2023 21:01:01:

Looking for a milling machine capable of milling parts for gauge 3 locomotive.

Preferable small enough to be man handled even if has to be disassembled into more manageable sizes.

New or used?

New - as above (Arc preferred)

Used - Ebay? Gumtree?

I have a Raglan, which suits me. My other (larger) mill is somewhat heavier.

Thread: What fuse is required
27/06/2023 03:43:34

Personally, I think a phone call to Chester should get the required info, but maybe this thread on a similar(?) machine might help.

https://www.model-engineer.co.uk/forums/postings.asp?th=67351&p=2

Thread: Putting on a fine cut..
26/06/2023 09:11:00
Posted by noel shelley on 25/06/2023 14:59:44:

For the final sizing lap or use a cylinder hone. Good luck Noel.

Precisely!

Thread: Cure for Tight Nuts
26/06/2023 08:50:34

It would be the $20K (note upper case ‘k&rsquo ridiculous price tag placed on that rod in the video hype.- unless it is to some aeronautical standard - that would put me off bothering to watch that. Even so, if it needed ‘saving’, would it still be to the prescribed acceptable standard?

Thread: Identify imperial bolt size
26/06/2023 08:40:32
Posted by old mart on 25/06/2023 19:50:20:

60's is vintage, but not as vintage as me. I'm in my 9th decade when you count up the decades starting with 1949. Only the other day, I tapped two holes for 4BA screws as there were plenty of countersunk ones within easy reach. And they are in the new Atlas 12 x 24 cross slide which has now got threads of 1/2UNF, 4, 5 and 6mm plus the 4BA's in it.

Edited By old mart on 25/06/2023 19:53:31

The item may not be classed as ‘vintage’ but the thread may well be! How old might a vintage wine be? Classic cars are generally over 25 years and veteran cars are pre-1930?

Thread: Groove/cutoff tools wants to dig in too much
22/06/2023 10:02:34

Maurits,

Don’t turn it around, in a 3 jaw chuck, if there remains any concentricity issues. Even removed and replaced the same way round is ill-advised, if concentricity is important.

Thread: Lathe/VFD/DRO issue
22/06/2023 09:48:15

My personal view is it is dangerous junk.

Robert hit the nail even more squarely on the head. A lot is junk and some is potentially dangerous. I believe all their stock likely falls into a non-compliant category in some way - whether it be safety, conformity, QA or other short-comings.

Thread: Groove/cutoff tools wants to dig in too much
22/06/2023 05:24:27

Do take Chris’ comment about ‘above centre’ with caution, unless/until he confirms the true precise position - in relation to it being upside down.🙂 Mine is just below centre, if anything, in this scenario.

I always expect some slight displacement from its rest position, while cutting. That force should be constant if power feeding (well, more consistent than my hand-feeding!).

Edited By not done it yet on 22/06/2023 05:25:38

Thread: Stale petrol?
21/06/2023 21:59:36

Depends. Ethanol in fuel will attract water and may cause rusting. More recent petrol has contained more light ‘anes’ so will evaporate/disperse faster, leaving behind more of longer chain hydrocarbons (ie less volatile).

Our mini actually started on (mostly?) old fuel from about ten (perhaps longer) years ago. I doubt it would have done that with three year old fuel. May have had a sniff of ‘easy-start’ to help it fire initially, but once started it ran OK.

Modern fuels can encourage unwanted flora? (well not fauna).

Most certainly safest to clear it out - whether used later (diluted with fresh fuel) is up to you, after evaluation.

Thread: Groove/cutoff tools wants to dig in too much
21/06/2023 21:40:29

Just a few more things to be aware of.

Is the cutter positioned as close as possible over the centre line of the cross slide? That is the ideal position.

How far from the chuck is this groove? The closer the better.

Are you supporting the part from the tailstock? Every little helps, particularly if the groove is distant to the chuck.

How far is the compound slide extended? The less the top slide is extended from its slide, the better (and tightened down - locked - securely).

How much cutter overhang is there? The bare minimum is best. I adjust my parting tool extension for just over half way. If a large diameter, it gets adjusted more than once, starting short before extending.

How good are the spindle bearings adjusted?

if you have power feed on the cross slide, take extra care that the cut is stopped before the feed screw threads jam up!

There may be more, but you get the idea that rigidity is paramount.

Thread: Broaching
21/06/2023 17:20:52
Posted by Ian Hewson on 21/06/2023 17:10:31:

Thanks Jason, that is what I suspected, didn’t know how deep the broach went into the hole before cutting started.

Ian

That depends entirely on the shim thickness in use, surely? The supplied shim(s) will likely start the next cut while using the full length of the broach. A thinner shim added will mean the broach will ‘fall in’ part-way before the teeth engage? think what would occur if a shim wasn't added!

Thread: Groove/cutoff tools wants to dig in too much
21/06/2023 17:15:05

You may not ‘feel’ any slop. But we should be talking ‘rigidity’. If the set-up is not as rigid as possible, trouble will arise when parting off (as you say in your post). A groove is nothing different to parting-off, really - just not as deep!

Obviously tool condition can be a factor but if that is OK, then you likely have too much machine wear, or too much overhang. QCTPs are not always the best option for small, worn machines!

I never really used the silly, angled parting-off tool holder I bought (as part of a ‘special offer’ when buying several holders with the tool post). Rubbish design, as far as I am concerned - the centre height changes every time the cutter is extended, or retracted, in the holder. Cutting from the rear is far better than struggling from the front - every day of the week!

Are you using any cutting aid? It needs it - and continuously - IMO.

Thread: Broaching
21/06/2023 16:55:25

Please provide the specification of your “No 1 Press”. I expect it will.

If the flywheel is 25mm diameter, most certainly yes. If flywheel diameter is over about 350mm it might be getting tight? Depends a lot on the shaft diameter, I expect, when approaching the maximum (but maybe the flywheel might fit over the press, if there were few spokes?).

I’m guessing/assuming the throat depth of your No1 arbor press to be around 180mm?

Thread: Dro advice for mill
21/06/2023 12:03:32

Go for the three mm decimal places - whatever it might be.

Reason is that sometimes you may need to be ultra precise - - at least erring on tne one side of the second digit.

Basic 0.01mm may appear close enough but look at the tolerances in the spec. A digit out in the last decimal place one way and then the other can very occasionally be a bear. Thinking here of shrink fitting, as much as anything.

Thread: cutting a v grove in iron
20/06/2023 14:04:33
Posted by Oldiron on 20/06/2023 11:56:47:
Posted by Speedy Builder5 on 20/06/2023 08:28:54:

Sometimes a simple wooden jig will suffice. Choose a hard wood like oak or ash. These are a couple of door stops I made for an older Toyota jeep where I had to mill out a section on the slant. To stop things moving about,

A little off topic but I take the chance of being called pedantic. Calling a Toyota a Jeep is like calling a Ford a Vauxhall or a Bridgeport a Proxxon. I get really annoyed when people call my Nissan a Jeep. angry

Ok will run & hide now. wink

regards

Not a lot different than calling all vacuum cleaners “Hoovers”? Bad enough when one cell is called a battery.🙂

Edited By not done it yet on 20/06/2023 14:04:49

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