Member postings for Ian P

Not sure what C/S 3mm screws are but you could try cutting a slot with a reduced diameter Dremel grinding disk, (if the screw head is proud then no need to reduce the disc diameter).

If the woodscrew is long and has been undisturbed for a long time even a perfect slot and well fitting screwdriver blade may not work and just shear off.

Ian P

Its something that always puzzled me that one would take care to machine a register accurately and then not use it as a precise and repeatable locating device.

The only function of a loose fitting spigot and recess is to roughly align the two before getting out the Manchester screwdriver!

I suppose its an acceptable method for something that is not intended to be taken apart.

Ian P

Judging by the pictures of your lathe the photo above is not at all similar as regards the headstock and spindle construction.

The link that Dave Halford gave (a few posts back) is much more relevant. It may not be identical as it does not have the back gear but if its the same make of lathe then the manufacturer will probably have used the same general design and there are enough clues in the drawing that will enable you to proceed.

It looks a really nice lathe and I suggest taking care and not rushing disassembly, hopefully there is a flat or dimple where the grubscrew sits so that any burr does not damage the front bearing (spindle must come out from the front)

Ian P

I have have had two of the assorted O-ring boxes for over 10 years now and have used about five or six rings out of them as they never seem to contain the seal I need!

I buy rings online as as when needed

Ian P

Full marks Milly, for getting through the picture posting maze!

I think they are tubular rivets or eyelet sleeves (often set with rotary tooling)

Electrical ferrules have either a moulded-on plastic 'funnel' or the end is flared slightly to enable easier wire insertion

Ian P

To select a suitable motor or drive system by you will need to ignore factors such as 'D shaft' and 'drill body clearance' (is that because of length?) and concentrate on working out the overall power requirements (and as Martin has just so eloquently explained) the actual mechanics of the rig.

My understanding of what you describe as 'cordless drill replacement motor' would be a small permanent magnet brushed motor with a shaft about 4 or 5mm diameter. Even if you could couple that shaft to your 12mm leadscrew its never going to have enough oomph to do anything but just spin it, as soon as any load is applied to the nut it will just stall. Cordless drills get away with physically small motor because they incorporate reduction gearing between the motor and the chuck.

What you actually want to use the rig for, matters to no one here, but if we knew a little more about the weight of the moving carriage and what force the cutting tool 'sees', plus pictures of the setup, then I'm sure you will get some good advice here.

Ian

Disregarding the motor and power supply for the moment I would have serious concerns about spinning a 5 foot length of commercial threaded rod ar over 1000 RPM. The root diameter is a little over 10mm and whilst the nut will constrain it at some parts of the traverse there is always the potential to whip.

You mention using a lathe cutter but we dont know what you are machining. If this 'jig' has 1.5m of travel then presumably you have a lathe with a very long bed in which case why do you need the 'U' channel? Better would be to make a carriage that slides along the bed and (because a wood lathe does not have a leadscrew) pull the carriage along with a loop of timing belt stretched between two pulleys, one being driven by something like a car window motor.

Is the work in the lathe itself rotating whilst the cutter is travelling?

I see plenty of woodworkers use a router mounted on a carriage in order to remove stock with relatively low loads on the workpiece.

Ian P

I like the lavatory chain on the clapper box retractor!

Ian P

We must be lucky in Cheshire as we have excellent RM service. In 10 years I have only had one sending failure (A Saturday Special Delivery that did not get to the customer until the Monday). As regards receiving mail it generally arrives as expected with the occasional surprise when 2nd class arrive the next day.

I've no illusions that some places do have problems, what we need is a 'down detector' type of website that shows the bad areas where its best to send by another carrier

Ian P

Without knowing where you live your RM statement is pointless!

Do we presume you are not in the UK?

Ian P

I also missed that the question was only for a theoretical reason.

Ian P

If Mark is making a shaft with 9 splines why are minutes and seconds involved?

360 divided by 9 is 40 ordinary degrees

Or have I missed something?

Ian P

I mentioned the limited lifetime earlier in the thread but I think it only refers to the cast iron bed. Maybe like 'Mission Impossible' it then decomposes leaving the owner with and assortment of components lying on the bench

On a more serious note. The headstock casting looks to be a strong rigid structure (even better than the plain spindle version) which is good news, what does not inspire confidence though, is the small diameter of the motor itself. The radial depth available in small overall diameter and a hollow spindle does not leave a lot of room for the stator windings, rotor and magnets so I suspect the motor will be limited as regards torque.

The brushless motor, spindle and the bearings appear to be what would be described as as 'cassette' that installs in the bore of the headstock casting. Given the limited length and diameter available I think the bearings themselves are not going to be taper roller or deep groove types but more likely quite narrow section ballraces, how well they will perform as lathe headstock bearings we will have to wait and see.

Ian P

No must about it, hollow shaft motors are available.

Ian P

I regard all the product descriptions given on Banggood, Aliexpress, Vevor and Amazon as purely a 'guide' rather than an exact and true definition of what is being sold. Amazon seem to get away largely by just showing as little as possible rather than a full description.

The Australian Vevor lathe linked to by the OP has a 'Main material' of HT200 Cast iron with a lifespan of 3 years! what on Earth is that meant to mean?

Regarding the drive/motor arrangement. They do stress the 'no belt' drive and I find it unlikely they would use a geared drive, it would be nice to think that the direct drive motor has a large hollow spindle but its probably my wishful thinking.

If it is a direct drive motor then one would hope that the spindle design and the bearings its mounted on are in keeping with it being a lathe headstock rather than just a general purpose brushless motor.

Ian P

Whilst I dont have one of these, I will definitely get one or two next time I visit IKEA.

BigClive has done a 'review' on Youtube my impression is that the 'Smahagel' (it used to be called Kopla) is about as good as it gets regarding quality and performance and probably safety too.

IKEA Smahagel USB Adapter Teardown

Ian P

Definitely a similar method of tightening but its less than ideal from an engineering point of view as the spanner is twisting the tines of the collet. Even odder in my case is that this particular collet was holding a LH 3mm drill.

The spindle is solid and has the female thread at the bottom of the tapered bore but I can only presume whatever was being drilled did not put too much load on the spindle.

In the next day or so I will post pictures of the spindle unit and some other parts that I have, I have a feeling its Swiss (possibly Schaublin) and probably from a 'auto' lathe.

Ian P

In my collection of 'it will come in useful one day' I have a plain bearing spindle that accepts this collet. Unusually the front of the collet has three flats that allow it to be tightened from the front (there is no drawbar hole).

Parallel part of body is 6mm diameter and the thread is M5 fine, overall its about 40mm long. It has the mirrored 'C' logo which I think is Crawford and also has 1801 stamped on it.

I'm curious what this type of collet was used for

Ian P

Also please spend a few seconds writing a description of what you are linking to.

For most forum members its not a great hardship to cut and paste a link but if the item you link to is of no interest it becomes an annoying waste of time.

Ian P