Member postings for Ian P

I this a pre-engaged arrangement?

Ian P

At which end of the shaft is the Bendix device?

If as you state the 10t pinion is mounted on the roller clutch then presumably when the pinion is thrown out of engagement with the flywheel gear the whole shaft (with its significant mass) has to move rather swiftly as well.

As Tim mentioned cyclic errors in the shaft will not matter a jot assuming the pinion and motor axis are somewhere near parallel (say within 10 degrees)

Ian P

Have I misconstrued you last post Jason if I assume that the change to new forum software has been abandoned?

When the subject was last aired I understood that work was in hand to update or change to a new format. I'm happy(ish) with it as it is so I'm not pushing for change but I do look forward to it being given the boot.

Ian P

Did you mean to show a link to whatever 'this' is?

Must be extremely thin and fragile if its anything like any fountain pen I have ever seen

Ian P

Table saw, milling machine, slitting saws, angle grinders and almost anything else commonly (or uncommonly) available would struggle to cut a strip 1.4mm x 2mm.

Doable with scalpel if Balsa wood was acceptable

Ian P

As Pete says, leave the screws/bolt in but about one turn slack. Hit the head of each bolt in turn (decent wallops) with copper/ali faced hammer and the joint should separate easily.

Ian P

I cannot speak for the other "you's" on here, but I dont buy in the the spherical washers at all. The soft Scotchbrite material will conform to whatever is clamping it.

If you want a non wobbling driving flange to mount a rigid grinding wheel on a cheap bench grinder then some engineering is involved. I made a custom ali flanges for mine and did the final machining by clamping the whole thing on the lathe bed so that it could be powered up and machined using its own motor.

Ian P

I think one would have to read the manufacturers specification but the wheel you show on the spindle is not a grinding wheel in the usual sense. Its specifically made for surface finishing or surface preparation rather than for, say toolgrinding.

Whilst I dont have the same wheel I have seen that particular one on a floor standing double ended polishing machine with those wheels mounted on the tapered screwed shafts. I'm sure its acceptable (and maybe preferred) to have them clamped between the usual two flanges but as the wheel itself is not solid (as a normal carborundum) wheel then it probably does not need the normal paper washers as it crushes to some extent when its clamped.

I certainly dont think it needs spherical washers, a spacer of plastic, ali or whatever you have lying around will do.

Ian P

But that is the only time the flip up display feature brings any benefit to an otherwise very ordinary digital caliper.

I purchased the identical item a few months ago and have never actually made use of it so its languishing in its box. Yes it can be used left handed in the lathe, but it then needs both hands if a button has to be pressed.

Ian P

I stopped worrying about what Google (and many other companies/organisations) know about me, it seems even if one goes 'off grid' the data is still out there. I'm not sure where my (Huawei) phone keeps its phone numbers but when I last looked at my SIM card contents on a USB reader it only had about twenty phone numbers which are a hangovers from a previous Nokia I had.

I dont think this video (link below) is taking this thread too far off-topic but its enlightened and frightened me on the subject of WiFi

WiFi visibility

Ian P

https://www.youtube.com/watch?v=KXEe2kqiYIM&t=191s

If you do get the present it will be well deserved

+1

I have used stainless wire rope in the past but the cable in your picture does not look like any I have seen before.

Certainly the colour looks wrong for steel but also the cut ends look remarkably un-frayed.

Is the wire plated or is the colour balance wrong?

Ian P

I run my M250 off a VFD and most of the time leave the headstock gear selector in the 550RPM position which is as near a straight through drive as it can be. At very slow motor revs (about 5Hz) there is a chattering noise from the gears until there is some load on the spindle when it quietens down. (same as the infamous cloth effect). If your lathe has a single phase motor, (which are not a smooth as three phase ones), then that might explain some of the noise you hear.

Ian P

I'm looking to buy another pair of digital calipers but have some questions about their operation that never seem to be answered by reading the description or specifications shown in the brochures or the sellers website.

Battery life does not bother me but I hate the auto-off function especially if it does not retain the reading and one has to zero the caliper every time its switched on. I have two Mititoyo calipers as well as 3 or 4 Lidl/Aldi cheap jobbies but now I am looking for a caliper with a larger display for everyday use.

Am I the only person that thinks product information and descriptions on Amazon are really poor (applies to most things they sell).

Ian P

I have an imperial M250 so fitted a DRO to make the machine more user friendly (the graduations on the handwheels are just plain confusing). The scales I fitted were from Machine-DRO.

The longitudinal scale is optical so quite bulky but there is plenty of space at the back of the bed so is the cheaper option. For the cross slide I used magnetic scale fastened to the tailstock side of the cross slide because being only about 10mm wide has minimal effect on how close the tailstock can be to the carriage. (magnetic strip is let in to the ali extrusion visible in the picture.

I cannot recall whether I had to drill and tap any holes in the cross slide (but it would not have bothered me anyway) but I had to remove the ball oiler fitting so that the read-head mounting block could be mounted easily. I remove the head when I need lubricate the carriage.

The M250 is good machine and I'm sure it will give you good service, the main annoyance from my point of view is the need to mess about with change wheels nearly every time I do any screwcutting (and this is a machine with a screwcutting gearbox!

Ian P

I agree the rotor mounted centrifugal switch is a neat idea but the downside is the brushes/sliprings carry current all the time.

The one picture that I thought might eleicit the most clarification is the one showing the brass plate that clearly shows the model type to be 'BA 147'.

Surely this must be in some old catalogue somewhere?

Ian P

As I mentioned earlier this motor is also being discussed on another forum. Below are some of the pictures from that thread.

Ian P

I have a vague recollection that (about 8 or 10) years ago that a patient under surgery suffered because some jointed instrument had crevices that did not fully sterilise. One of my relatives sold medical equipment to theatres and I said I was sure I could design something that dismantled for cleaning but he assured me that I needn't trouble my little self as the products in use had separatable components.

I have a pair of forceps like Michaels and I would say that because the length of the slot is long in relation to the thickness of the part that has to pass through the slot, they could be manufactured by the blacksmithing method without even needing to apply heat,

Ian P

I imagine that surgeons instruments would need to be dismantled for sterilisation so unlikely to box jointed (in the blacksmith forged) manner.

Ian P