Member postings for Martin Cargill

We used to make tools for that job from old 1/2" sockets with two pieces of key steel welded to the outside.

The original motor is probably a Dahlander connected motor (Google it) and will be very difficult to connect to a 220 volt output VFD as you can't simply connect it in delta as you would with a single speed motor. If you need the two speeds the easiest way would be to do this with pulleys.

This then gives you a choice of using a single phase motor or a suitable 3 phase motor and a VFD (if you want the luxury of variable speed) .

SOD. The company where I served my time painted transformers (the big ones at the end of your street) using flood painting. The transformer tank was hung from a crane over a large trough (about 15' square). The trough had a pump, connected to a hosepipe and the operator hosed a coat of paint over the previously shot blasted surface.

Martin

Many thanks for the replies.

Pete, the tanks you found on ebay looked just about right but I realised that they have one flaw that stops me from using one, in that the existing tank has hydraulic connections at the side and the bottom and I need to be able to get my hand inside the tank to couple up the pipe connections.

Hopper, I followed your guide and found a plastic tank that is meant to be used on the end of a hydraulic pump/motor combination. The mounting for the pump etc is large enough to get my hand inside I will just have to blank off the existing filling hole and make a cover for the end of the tank.

Thanks again.

Martin

Not directly model engineering related but possibly something that somebody will have an idea for. I am an engineer who repairs wood working machines. One of my customers has a saw that is used for cutting rolls of lead (think chimney flashings). The rise and fall of the saw uses hydraulics and the saw has a small hydraulic oil tank that resembles a Swarfega tub (it's about 150 mm square and 300 mm high).

The tank is plastic and the combination of its working environment and the fact that it is full of oil has taken its toll on the tank and it now leaks and the system needs to be topped up every day. The state of the plastic means that I do not want to try a repair as I'm sure the plastic will simply disintegrate if I touch it.

The manufacturer of the saw no longer exists so I can't get a replacement from them.

So, the question is, has anyone seen anything like what I am talking about that could be adapted (other than the obvious use of a Swarfega tub !, which probably would not take to kindly to being filled with oil and subjected to vibration). The hydraulic connections mean that it needs to have at least one flat side and base i.e. it can't be a cylinder.

I know that I probably could weld up a steel box but I would prefer something that's available off the shelf

Thanks in advance for any suggestions.

Martin

Bill,

Thank you for the info. My searches on Ebay etc didn't find the set that you highlighted. I've now ordered a set and I'll see how they get on. If they don't manage to do the job then I'll be making one of my own.

Thanks again

Martin

Not directly model engineering related but perhaps someone one here has an answer.

I have recently been servicing and fitting some linear bearings to a couple of CNC routers. I have encountered a problem in that there is not enough space between the rail and the alloy plate that the bearings are mounted on to get access to the grease nipples with a standard grease gun end.

This is a problem because the linear bearings can't be pre-greased prior to assembly as they are fitted with plastic "keepers" that are not supposed to be removed prior to installation on the rails.

My own grease guns and any that I can find all have ends that are 15 mm in diameter. To get onto the grease points that are there it would need one about 11mm diameter.

There is not space to unscrew the existing nipples (they are 45 degree angled ones) so adding an extension to the bottom of the nipple is a non starter

Anyone got any thoughts as to how to grease these bearings?

Thanks

Martin

Edited By Martin Cargill on 17/07/2022 15:19:42

Be aware that taper locks use a BSW threaded grub screw with a metric socket be they for metric or imperial shaft

Martin

Position 1 Terminal 1 is connected to terminal2

Position 0 nothing is connected

Position 2 Terminal 3 is connected to terminal 4

Terminals 2 and 4 are permanently linked together

And so on for the other 3 switch sets

What are you trying to reverse?

Martin

In our workshop the Gaffer allows us to all huddle around a candle. If the workshop temperature drops below -10 he will even allow us to light it.

If the existing motor is fed through an overload relay or some form of motor protection switch then the current setting on the protective device may give some idea of the motor rating. Exercise caution though as some DIY conversions may have used whatever was to hand at the time and may not have been properly rated for the motor.

Martin

Thanks for all of the replies. Can find a lot of similar ones but nothing exactly matching our requirements. I've given details to one of the suppliers but they have come back with a price of over £2000 for 500 custom made screws. Back to searching.

Martin

For a machine one of our customers has we need to find some replacement screws that hold the cutters in place. The machine manufacturer has gone out of business so we can't obtain spares from them.

The required screws are a shouldered M5 countersunk Torx (T20) head 13mm long with a 6mm diameter shouldered portion, the shouldered portion is around 6mm long (including the countersink head). They look like a larger version of the screws that hold inserts into lathe tools.

Would anyone have any Ideas for a possible supplier?

Any suggestions welcome

Thanks

Martin

A word of caution. One of the members of the railway society was making some parts for a university project and he asked me for a couple of extra nuts to fit the bolts he had purchased from one of the major DIY stores (B&Q). I got him a couple of nuts from the back of my van (M5 x 0.8, metric coarse), only to discover that they wouldn't fit. Checking the packet it turns out that the items he had purchased were M5 x 0.9. Try finding them anywhere else.

Martin

Can Trevor please contact me regarding the nylon 66 rod I have advertised for sale. I have received your reply but have no way of contacting you. My email address is [email protected]

Thanks

Martin Cargill

Regarding insurance My father used to live in Malaysia, out there they had a system where all of the insurance companies were, by law, required to charge the same for their products. You made your choice based on the service you received from the company of your choice.

Sounds good but it means that the insurance companies agreed the price between themselves, and you can easily work out what that meant....

Martin

Emgee

I have a U1 universal. Its max speed is 1010 rpm on horizontal. I have a vertical head as well so this may be capable of 2020 rpm if the bevel gears double the speed.

Martin

A friend of mine tells of the time when they caught a labourer using a pillar drill with four micrometers as G clamps. Might have got away with it but he had used mole grips to tighten them.

Our surface grinder at work has a leaky arbour bearing seal that sprays a little oil into the grinding dust. From time to time this mix is set on fire by the sparks from the grinding wheel. not serious as it just smoulders a bit, but it does mean stopping a grinding operation to clear the glowing embers. It produces an oily smoke.

Martin

If you have five minutes to spare google "Dave Allen telling the time". One of his best !

Martin