Member postings for Ian Parkin

the kangaroos they all look a bit sleepy...were they?

I have too many printers so if anyone wants a HP laserjet 5000n its free to collect from sheffield

its a a3 black and white with a 250 bin and a 500 sheet bin that both take up to a3

you can add a duplex unit if you want to do both sides in the one pass

its full of toner and

theres a new boxed genuine toner with it all instruction books and lots of connection possibilties

perfect working order

If you want to send me a accurate diagram i can make you a new shaft complete and post it on?

I liked the line about “for your convenience a set of draper allen keys will be included” for 15k i would expect wera keys..

Bill

the customer needs it running asap so its up to them

they have 12 of these motors so it may be well to see how much a rebuild is

ian

Well it was blowing the fuse (15 amp) resistance between the leads was only 1 ohm on removing the brushes a strong smell of burnt windings..

i may strip it down next week just for a look but I don’t think these types can be rewound/repaired economically

in this machine it has to start for a preset time (sheets delivered) usually about 1 second then stop for perhaps 2 seconds then restart and do that for 12 hours a day…perhaps a better way would have been a induction motor running continuously via a clutch and brake

Edited By Ian Parkin on 28/07/2023 18:44:39

from the machine maker its £2500

From the site hairy Pete linked to this is what i need

Unique Features of Brushed Pancake Motors

Brushed pancake motors, or printed motors and Scheibenläufermotoren as they are known in Germany, have a number of unique features that make them stand out from other electric motors:

Size
The motor is much smaller and thinner than normal iron-core motors

Rapid acceleration and deceleration
The armature is very thin giving low-inertia and exceptional torque ratios. The result is extreme acceleration with a typical pancake motor able to accelerate from 0 to 3000 rpm in only 60 degrees of rotation. To achieve rapid acceleration and deceleration printed motors can handle a peak current of up to 10 times the continuous rating which would be impossible for iron-core motors without demagnetising

Zero-cogging
Printed armature motors are the only electric motor variant in the world with no torque ripple. A conventional motor has a tendency to prefer certain positions where the magnetic alignment is best. This is called cogging and creates torque disturbances. The flat armature motor is ironless and is thus intrinsically non-cogging. This gives perfectly smooth rotation at any speed with no ripple effect. Click here for a graph that explains this

Long brush life
Because brushed pancake motors have no iron core there is minimal inductance. The result is no arcing, because there is no stored energy in the armature to be dissipated during commutation. In an iron-core motor a lot of energy is stored in the magnetic field of each coil. When this field collapses, the energy tends to be discharged by arcing to the brushes and this wears them out. Depending on the application, the brushes in our printed motors tend to last as long as the bearings.

Reliable at high speed
Brushed pancake Motors do not suffer from arcing as thus can perform reliably at very high speeds

Instant torque delivery
Another benefit of minimal inductance is that the current flows into the armature extremely quickly (in less than one millisecond). This delivers instant torque

Flat torque curve
The ironless disc motor has a perfectly flat torque curve up to very high speeds whereas iron-core motors tend to fade at high speeds. Thus a small pancake motor may be sufficient where you would have to select a much larger iron-core motor to achieve the same torque at high speed

Easy to cool

That’s the type but surely there must be a cheaper replacement

Hairy pete

it is off a longford

Ian p

have you seen one of these before? What would it be called?

Ian p

Sorry for got to say its about 7 inches diameter and the alloy bit is about 3.5 inches long

its a fairly powerful motor but i have no specs at all

its fused by a 15 amp so I’m guessing it draws about 8-10 in use so 500 watts or so

I have a need for a motor like this one

its dc 50v

it needs to fit in a smallish space hence its build (like a pancake)

I have had 8 packages from them some with 12 items in all arrived very quickly no damage

some workshop stuff electrical switches etc

great site and everything good so far

Whilst on the subject of cruises myself and wifey have booked a northern lights trip from London to the coast of Norway well up into the artic circle (15 nights) in November

has anyone done this before or similar and can advise any tips? What to take to wear what photo equipment to take..do we see much daylight?

Ian

When did electrical back boxes change over to metric then?

were they 4 BA then changed over to m3.5

Could be worth trying m 3.5

lots of those in a UK home remove a screw from a switch plate or socket just to see if it fits

m 3.5 is about 42 tpi

But actually i have had a change of plan theres so many good looking guaranteed working mechs on eBay for next to nothing i bought one of those

many thanks for all your replies

i have now removed the escape wheel by loosing the plate nuts and spreading the plates enough just to remove the wheel.

i was going to drill the worn bush out and then make a new bush with a backing plate that i can then bolt onto the outside of the frame so for ease of adjustment removing the wheel if needed.

its a bodge but looking at removing the frame with all those shafts looks daunting

Ok thanks Michael

so not just drill out using the oil sink and press a bush in ?

why the centre punch marks at 6 to 8 o clock?