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Member postings for Michael Horner

Here is a list of all the postings Michael Horner has made in our forums. Click on a thread name to jump to the thread.

Thread: Mini lathe feed
13/01/2021 17:40:33


Hi Darren

If you look at picture 29 it only shows 1 half nut.

Cheers Michael.

13/01/2021 17:26:17

Hi Darren

If there is a swarf guard over the top of your lead screw there may only 1 half nut fitted.

Cheers Michael.

Thread: Cross slide adjustment?
02/01/2021 12:54:27

Hi Terry

The below quote is from a Wm290 thread on this forum.

It would appear they have gone to a tapered gib to accommodate the DRO fitment.

"What it definitely doesn't have is a cross slide lock - I know some of them do, but the new ones with the tapered Gib don't".

Cheers Michael.

Thread: C0 Lathe Blowing Fuses. Control board short?
02/11/2020 22:11:10


Hi Hollowpoint

The link should show a circuit diagram of a controller board, unfortunately not yours. The guy is John Swift and is on this site but is dated 2010. It may just give you some idea of what you are taking on.

Cheers Michael.

Thread: What Did You Do Today 2020
04/07/2020 13:49:05

psudo g71.jpg

Having a go at making a Psudo G71 Roughing Cycle for Mach3.

Not had the courage to try it on the lathe yet.

Going to wait until I do the corresponding G70 so what ever I make will be finished to size.

Not sure how the tool nose compensation will work out.

Cheers Michael

Edited By Michael Horner on 04/07/2020 13:50:02

Thread: clarke cl500 improvements
04/07/2020 13:35:47

Great stuff John.

It's a nice feeling when you modify a machine to make it work for you.

I have a Chester Mini Lathe which also get a kicking but you can't beat them for the money.

The mods I have done are to make it more like the machine I want not because there was anything wrong with it.

The Great Sage SOD was saying £20K for a model engineers lathe with all the bells and whistles but who would pay that much money out?

Cheers Michael.

Thread: BBC Micro Boxford TCL125
25/04/2020 10:20:39

Hi Len

How's your refit going?

Glad you mentioned about the contactor drive being on he stepper board, I hadn't realised.

With that in mind I have bought a 6 axis break out board with 3 relays.

I have got my tool turret mostly fitted just need to fettle M6 to M5 screws. I rejigged the turret driver software from my Denford and it seems to be working.

Cheers Michael

05/04/2020 13:16:29

Hi Len

Does your cable plug into a board like this?

From memory(very dangerous). I removed the board and made my own interface PCB which then plugged into a generic 5 way break out board which then went to mach3 through a parallel cable.

Cheers Michael.


Thread: What Did You Do Today 2019
10/09/2019 23:30:10

spindle2.jpgFinally got my calculated 18000 RPM spindle done. Motor and spindle get very hot so will keep me warm this winter. Hopefully will bring the machining times down, 10 hours was getting a bit long!

Cheers Michael.

Thread: strange power socket
15/08/2019 06:40:52

Hi Anthony

Wish I still had the fork with the bent prong! My mother kept it as a reminder.

I think that is why they eventually went to the shutter type of domestic socket.

On here they call it Darwinism! smiley

Cheers Michael.

Thread: Dam Solution?
07/08/2019 06:05:22
Posted by John Olsen on 07/08/2019 05:32:37:

. So since you are going to need a pump anyway, why bother trying to set up a siphon?


Using a siphon would only require energy to prime it then it would run for free.

Cheers Michael

Thread: Electric Cars
14/07/2019 07:12:10
Posted by Michael Gilligan on 13/07/2019 23:30:27:

The exit lanes merge into one after a reasonably short distance [the implied rule being that the two lines of vehicles will take their places alternately].


Hi Michael

You answered your own question.

This would be my take on it, unless they are going to program in male aggression and selfishness.

The cars would agree amongst themselves who would be first away from the lights.

Cheers Michael

Thread: spindle bearings
19/06/2019 18:56:16

kx3 spindle.jpg

I got chance to fit the bearings today. It's not good.

Spun up the spindle in the lathe so only the ACB's were spinning, you can hear a noise and feel a vibration.

If you let go of the hub the noise and vibration disappear.

So it looks like I will have to dig deep and buy a pair of matched bearings.

Cheers Michael.

17/06/2019 18:25:02


The cheapy bearings arrived today. I spoke to Ketan and he gave me some advice on fitting the bearings so will see how it goes. Probably fit them at the weekend.

Cheers Michael.

17/06/2019 18:13:03
Posted by RMA on 17/06/2019 17:34:24:
Posted by Ketan Swali on 17/06/2019 12:31:54:
Posted by RMA on 17/06/2019 08:36:45:

Yes I would generally agree with that, but the OP suggested two options including changing to tapers. Personally, if I was going to use the machine a lot and hard, I would change to tapers if the castings allowed for the mod.

Cost is another concern the OP has, but again it depends what the machine will be used for.

I understand, and after re-reading the OP, I also get where you are coming from. In that respect, you are right.

So, I need to clarify my earlier position. This is my opinion... Most machine designers have taken various factors into consideration, and reached a balance/compromise for the type of bearings they have used in the spindle of their machine. For this reason, I have gone along the line of changing like for like... where possible.

So, if one still wants to change the type of bearings which are in their spindle assembly, here are some of the points to consider...

For example, changing from general 'ball raced bearings' to 'angular contact (ball raced) bearings, will allow for a good improvement in accuracy. Similarly, going from angular contact bearings to Taper roller bearings will give a further improvement in accuracy.

The pre-load on bearings is one of the factors. All other things being equal, if you change from ball raced bearings to angular contact bearings, the max speed will reduce based on contact angle and pre-load, and the max speed will further reduce if you change to taper roller bearings, mainly due to the surface area of the rollers in contact with the inner ring, and how much pre-load is applied.

Another factor is the electronics. If changing from one type of bearing to another, one needs to consider the following: With more pre-load facility available for Angular contact bearings, the motor 'may' have to work harder to turn the spindle, and it may have to work even harder for taper roller bearings. The question then arises, is the motor up to it?, is the belt drive or gear train up to it? So, one has to consider the balance of pre-load to motor load to forces on the gear train/belt drive, to get the accuracy required. Are the electronics up to it?

Another factor is heat generation.. are the new bearings lubricated correctly with the right type of grease?, and is the quantity of grease put inside the bearings correct (usually roughly less than 20% of internal volume of the bearing). If this is correct, how will the pre-load on such assembly behave in terms of heat generation, if you change from Angular Contact bearings to taper roller bearings (TRB), when running the spindle at 6000 rpm?, combined with the load on the motor... correct running in procedure - short term high heat generation before settlement, etc...

In our experience, going from ball raced bearings to angular contact bearings is a reasonable change one may wish to consider. However, going from ball raced bearings, or angular contact ball raced bearings to TRB, especially where higher speeds are involved, is something one should be more careful about, keeping in mind the points raised above. For manual hobby machines upto 3000 rpm, this may be a small issue.... subject to control board overload protection/or not.

There are various other points, relating to the cutting tools used before and after such changes, and their effects on the tool - HSS or Carbide (which need higher speeds). As carbide seems to be a new fashion thing, reduction in speed could have deferent effects on the cutter, as well as the results.

So, really up to the person making the change to consider many factors before making a change.

You also made a good point with reference to TRB: 'if the castings allowed for the mod' and/or the inner spindle assembly allowed for it.

These are just observations ( I am not trying to create an argument). teeth 2

Ketan at ARC.

Yep, agree, especially about the regard to lubrication. I'm going back many year's now, but I had to investigate several bearing failures and most were due to incorrect lubrication. A lot of technicians/mechanics thought that if the bearing and cavity wasn't full of grease, it wasn't lubricated properly. Fact was the bearings churn the grease and increase the temperature so much that failure is inevitable.

Have to agree with the bit in bold. Whilst playing I filled up the knackard bearings with grease and couldn't believe the increase in temperature at 3000 RPM, burning hand temp . As expected the bearings were growling. I stripped it back down and washed out the grease and just used a sticky oil and it then ran barely warm.

Cheers Michael

16/06/2019 15:22:32

Hi old mart

Thanks for that.

Cheers Michael.

16/06/2019 08:26:43

The bearings in my KX3 are I believe are a cartridge type. The markings on the bearings indicate they are a matched pair (7007C). In the first instant I am going to fit a cheap pair of angular contact bearings and try and find a way to apply a preload. They are back to back bearings so preload is not guaranteed. Thinking of dropping a shim in between the bearings, press it all back together again then do a spin test, tweek the adjuster nut until there is slight drag then lock up the nuts and test. Otherwise its £170+ for a matched precision pair!

Cheers Michael.

15/06/2019 08:51:58

Hi Kevin

How did you get on with your bearing replacement?

I am in a similar position with my KX3, it took a hard dive into the job and took out the bearings.

Cheers Michael

Thread: Honing motor cycle small ends
12/05/2019 08:24:14

"I used to fit and ream the pin bushes on victa engines and used an old piston as a guide for the reamer to help keep it square , i used to have a piece of plate that fitted over the cylinder mounting studs and it had a slot cut for the conrod so i could sit the piston skirt on it and line the whole lot up and slide the expanding reamer in".

XD 351

You should win the John Stevenson Bodger award with that one.


Cheers Michael.

Thread: The Chocolate Fireguard as designed by Mercedes Benz
27/04/2019 23:31:34
Posted by Mike Poole on 27/04/2019 20:48:28:

Some people sit at a standstill with their foot on the clutch, I do use the neutral selection on lights I know have a long sequence, I often turn off the irritating auto stop. The car wash is a bit of a problem with the low profile tyres as the guides can touch the rim of the alloys, the lads at the hand wash do a great job but the pressure washers are pretty fierce.


I believe I.A.M's recommend being in gear at the traffic lights so if things go pear shaped there will be some measure of control, I did query that this meant the engine wouldn't switch off and the reply was safety takes precedent over emissions.

Cheers Michael

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