Member postings for Ed Duffner

Hello guys,

At work I am trying to restore a Scabbler (concrete de-chipper) machine. Problem is, the motor makes a weird noise when running.

The motor is an induction type with permanent magnet rotor and a wound field-coil. There is no centrifugal switch and starting is handled by two 80uf capacitors wired in parallel.

It's switched on via a cylinder type, multi-pole switch which energises a contactor coil in a start position then springs back to a run position.

In the start position the motor sounds very smooth but when in the run position it sounds rough and the motor speed drops somewhat. It's like there's a choking effect or field being introduced.

I'm pretty sure I have wired the motor and controls according to the circuit diagram. Please excuse the use of an earth wire in one of the below photos, it's just a link, not an earth connection.

In the video I start the motor and release it twice so I can let you hear the 'choking' sound. It doesn't quite work on the first start.

I'd appreciate any ideas and your input as always.

Thank you,
Ed.

Motor connections.

On-Off-Start Switch.

Circuit Diagram

Edited By Ed Duffner on 04/03/2020 22:18:57

Edited By Ed Duffner on 04/03/2020 22:27:33

Hit & Miss engines (when they're running).

When I see a video of a Hit and Miss running I just want to reach into the screen and give it a helping 'push' to make it fire evenly on every revolution. I suppose it's just a personal idea that engines should have a steady, repeating sound.

I don't think I would ever want to make a model of one. Sorry to the Hit and Miss enthusiasts.

Ed.

Je vis seul, pas de probleme!

Eduard.

Edited By Ed Duffner on 07/02/2020 01:18:18

I have a Warco wm-180 lathe, I'm not sure how it's footprint compares to a Myford (I've never used or seen a Myford up close).

The lathe is free standing on the proper base and I will eventually bolt it down as I find it can start to rock when pulling over the chuck during manual threading. It's one of those roundtoit jobs that I need to do.

Ed.

I have 20mm thick or so rubber strips under my milling machine (WM-16) stand and also between the stand and mill. I believe it does reduce noise but I think it introduces bounce when interrupted cuts are taken, similar to flexing of the column.

The rubber was apparently an experimmental one used where my Brother used to work in the 80's, for a test on heavy grinders.

Ed.

" If you need a bigger blower you'd just have to find some bigger cans. "

Watney's Party Seven?

Ed.

Hi Gerry,

According to the 'old' Makita service software, the capacitor part number listed for the NHP1300S is 645011-4. It shows up as "End of sales" on the new Makita parts ordering website. End of sales can mean obsolete or out of stock.

Ed.

Hi Gerry,

The part might still be available from Makita or even an update to the switch and wiring, which Makita sometimes provide in the service bulletins. If you are in th UK and can provide the drill model number I could check on the Makita systems at work tomorrow(friday) if you like.

Just as a matter of interest, different countries sometimes have different switch and supression requirements for some of the Makita power tools.

Ed.

Steviegtr,

I used a lot of tallow and trefolex during my time as an electrican. I think also as a cutting aid for drilling with a holesaw but it smoked quite a bit and would probably be the same on a lathe and mill. There would also be some difficulty adding tallow to a rotating work-piece.

Tallow was always hard going when threading by hand until the workpiece got warm.

Ed.

Anodised aluminium, exotic hardwoods, animal horn perhaps. Maybee even some ordinary aluminium with an inlay of another material - e.g. abelone against the wearer's skin ??? What about plastics? Delrin, 3D printed resin or powder deposit, not sure what it's called.

The possibilities seem endless

Ed.

I still use floppy disks on my Amiga computers.

For the virii I would get rid of them, just my honest opinion. I'm sure there are copies of them archived at the companies who write software to tackle those. ...and I doubt you'd be unable to store them in the cloud (a remote disk somewhere on the internet) because of the risk and possible breach of usage agreements.

At HP our DAT tape backups were only guaranteed for 7 years by our IT Dept..

You could use an optical disk, but I've had a heck of a job getting my Blu-ray DVD writers to read disks on windows 10, but are ok on Windows 7. I have to go into device manager, disable the drive, then re-enable it so the OS can then read from it.

USB Thumb drives could also be an alternative but how long will the interface connector be available into the future?

Ed.

Merry Christmas everyone.

Ed.

According to the second chart on this page a 2.2mm drill would give 50% thread and appears to be ok for steel, stainless and iron.

Perhaps a change to a spiral flute or spiral point tap could help? depending if these are 'through' or 'blind' holes.

Ed.

On my Warco WM-16 mill I would often hear high pitched squealing coming from the motor housing when running at certain speeds, which I believe was a resonant frequency between the housing sheet metal and milling head.

To eliminate it I lined the housing with a self adhesive, sound dampening sheet used for computer cases.

Here is an example of the sheet, but I believe I purchased mine elsewhere.

Akasa Noise Reduction Mat.

Ed,

Hi Michael,

The motor itself appears to be just a simple dc motor used in toys etc, from online spec's.

Could the link wire actually be a sleeved, tiny coil, noise supressor and the 'other' connector is perhaps normally connected to, or in contact with a metal chassis of the player?

Ed.

I have built and occasioanly maintain the web site for my brothers tool hire shop, using MySql and PHP. It's hosted with "Unlimited Web Hosting". They have given us good customer support when needed, which thankfully has not been very often.

Ed.

If you happen to have a tracking number it should be possible to see where the missing items are.

I recently bought an old camera lens from Japan. With tracking, I could see it took 3 to 4 days to get to England, then a further 2 weeks to get through customs.

Ed.

Was the machining being done dry, without coolant or lube?

One of the forum members here has previously commented about the build up of aluminium dust on a bench sander which ignited when he later held a ferrous metal to the sander without cleaning off the aluminium dust.

I wonder what size aluminium has to be reduced to and at what temperature it becomes ignitable?

Edited By Ed Duffner on 14/08/2019 18:13:00

I have the Warco WM-16 and use a Vertex 100mm vise for most of the stuff I'm doing at the moment. I originally fitted one of the small display type of DRO to the machine from ARC Eurotrade. The X scale was screwed to the front of the table on 20mm deep mounts and the scale would often hit the Y-axis winding wheel.

I've since fitted an Easson ES12B with magnetic scales from M-DRO and the X-scale is mounted to the rear of the table. So far I've not been in a situation where the table has needed to be wound back far enough to cause a problem. It really depends on what you intend to machine and how big the initial part is.

Ed.

A few weeks back, I was looking at Neil's post on this forum about his Trace Elliot guitar amp and later went to Ebay to look for tools. On the front page of Ebay was a whole load of Trace Elliot amps for sale.

They say it's to help us, but ultimately it's google making even more money.