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Member postings for malcolm hollins

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

Thread: What VFD should I get
05/03/2022 11:12:41

dsc04895.jpgChesters and Warco doesn't have any Motor Pulleys Couldn't find any on internet decided to make my own.

Was going to make a single step pulley out of aluminium but Macc Models was closed.

Made a pulley out of Hard Wood .

Mill now works.

Plan to fit a 3 Phase Motor , correct size pulley and a VFD in thefuture.dsc04893.jpg

Thread: Chipbreaker lathe Parting Blade
04/03/2022 17:42:59

Clive

I have a1958 Buck and Hickman General Catalogue of Tools & Supplies they were selling J & S 42 - S for £1 14s 6d.

I have ordered the correct size Parting Blade for mine.

It is that I saw a You tube from U.S.A. that recommended using a Tee section Parting Blade and I was wondering if anybody had tried one in a J&S 42-S

Malcolm

04/03/2022 08:36:23

My J-S 42-S Parting Tool uses 3/32" x 5/8" Parting blades.

Can I get any "Tee" section Parting Blades that will fit my J-S 42-S?

Chronos sells Chipbreaker Lathe Parting Blades 1/8" x 3/4" x 6" and 1/8" x 1/2" x 4./2" which are the wrong size.(these are examples of a Tee section Blade)

Thread: What VFD should I get
25/02/2022 08:23:39

Howard (from a previous Post) yesterday emailed me Photos of a Chester manual which I printed out. Very useful manual.

The Mill is a Chester rf-20 or a rf-25 (I need to check the specifications against the Mill to find out which one is mine)

I now have the Belts sizes .A31 (A790MC 13 x 800) & A38 (A990MC 13 x 965)

I do not have the correct Motor pulley (4 steps ) My motor pulley has 2 steps)

Will check with Chesters see if they still have one.

The original Mill had 12 speeds (a lot more than the 4 the Gearbox had

George at Newton Tesla said I would still need the correct pulleys and belts when I used a VFD

24/02/2022 11:23:24

I have just talked to George at Newton Tesla . He explained that a VFD was the same as an Inverter and a 3 Phase motor was to best option (single Phase motor would have problems)

I will get my Mill going using the Belt/Pulleys (remove gearbox and refit the pulley assemble that is between the motor and Spindle)

Sell the Gearbox (use the money to get VFD option)

Then buy a VFD/Inverter out of the box package (easiest option)

I still don't what the correct belt sizes are - I will put the 2 pulleys in the middle of there adjustment and measure the distance between the motor , pulley assembly and Spindle. Knowing the motor speed and the pulleys diameter I will use an internet Pulley Calculator to get the Belt Lengths.

24/02/2022 08:07:21

What I had in mind was to remove the Gearbox and revert the Mill back to using Belt and Pulleys (I still have the original 4 pulley assembly to do this) Still would like to know the Belt sizes required.

The Single phase motor is only 2 years old so I was wondering if I could still use it. (Motor hp and rpm)

If that is not an option I would buy a 3 phase motor. (What hp, number of poles {speed}would be required)

I didn't know that some Mills have a motor reverse mine has not .

I would need a Single phase to 3 phase VFD if I want to stop changing the stepped pulleys to change the Spindle rpm.

I would like to point out that I was in the RAF for 13.5 years, Then as a Main Frame Computers engineer until I retired at 57.5 years old, .I am 77 now.

I have not kept up with the latest developments in electronics since I retired eg . VFD's etc but I have a fair idea.

23/02/2022 17:15:31

Having read up on VFD on the internet I know that I would need to remove the capacitators from the single phase motor in order for the 3 phase output from the VFD to run the motor. I was thinking if the motor was then not able to run the mill O.K. I could replace it with a 3 phase motor.

Some of the VFD I have seen on the internet reckon they will give the spindle speed.

23/02/2022 16:19:37

Several ME members have suggested I get a VFD for my Mill.

I would like a single phase input with single phase and 3 phase output (I could use 3 Phase if I needed to replace my Single Phase motor)

The motor on my mill is a Amtecs AMAS SR80G4 1 hp 1410 rpm.

I would like the VFD to display the Mill spindle speed , have a Filter and be able to controller my Single phase motor.

What VFD should I get?

Thread: Chester 20 Eagle
22/02/2022 17:52:09

Looks like I need a better pair of glasses.

I read vfd as vid . Know I know what a vfd is

22/02/2022 15:37:28

Hi John and Burnard

I am quite interested in getting rid of the gear box

Could you give me more information on what would be involved

What is a VID?

I presume that I would need a single phase to 3 phase convertor , a 3 phase motor and some sort of 3 phase speed controller..

A Block diagram and circuit diagram would explain a lot.

i am 77 retired at 57 and was a Main Frame Computer engineer but have not kept up with advances in technology so I am a bit rusty.

22/02/2022 11:09:58

Tried to rotate this photo of drawing .

Able to rotate in Windows 11 but when added to my ME album it didn't state rotateddsc04871.jpg

22/02/2022 10:45:48

dsc04869.jpgdsc04868.jpgdsc04866.jpgdsc04865.jpgdsc04864.jpgdsc04863.jpgMore photosdsc04862.jpg

22/02/2022 10:43:40

At present the mill is fitted with a Velocette pre war MAC Gearbox which I still have problems with.

If I cannot resolve the problems I still have the original Pulley assembly so I could get the mill going again.

The original motor has been replaced with Amtecs AMAS SR80G3 1 hp 1410 rpm (I do not know any details of the original motor)

Spoke to 2 ME members at last Fridays meeting and they said the lowest speed was too high to use a Fly cutter. They suggested using the largest pulleys on the motor and Gearbox to reduce the speed.

This would cause the 2 belts to foul the Column (i could make 2 Belt tensioners to push the belts away from the Column)

The Spindle and Gearbox pulleys have not been changed by me but I am not sure if I have to change the motor pulley when the new motor was fitted (Old and new motors may have had different spindle diameters)

The detail information is :-

Motor 1 hp 1410 rpm.

Pulley diameters on Motor 100 mm & 125 mm.

Pulley diameters on Gearbox 60 mm & 155 mm.

Pulley diameters on Spindle 130 mm , 150 mm , 170 mm & 195 mm.

Spindle speeds using Gearbox 820 rpm , 1200 rpm , 1550 rpm & 2050 rpm.

The distance range between the Motor and Gearbox is approx. 23 mm to 34 mm.

The distance range between the Gearbox and Spindle is approx. 21 mm to 31 mm.

Obviously the maximums would cause the pulleys to foul the edges of the bottom section of the belt , pulley Gearbox cover.

I do not know what the 2 belt sizes were when this arrangement was first put in use.

What I need to know is :-

Will the new motor be O/K. to give the correct Chester 20 Eagle speeds.

Speeds of Chester 20 Eagle.

Original Motor pulley diameter.

Both belt sizes when the Gearbox is swopped out for the original pulley assembly.

Speeds and Belt sizes should be in the manual which I don't have.dsc04869.jpg

Thread: What is this Chester Mill Model
20/02/2022 17:51:12

Howard

I am a new member of ME

What do I do to PM you?

20/02/2022 17:44:28

It is a Metric mill

20/02/2022 17:42:54

table is160mm x 500mm

x travel 250m

y travel 120mm

20/02/2022 16:24:46

dsc04843.jpgI need to identify what is the Model Number of this Mill which I think is made by Chesterdsc04843.jpg

Thread: What is it?
20/02/2022 14:04:51

dsc04861.jpgdsc04860.jpgAnybody anydsc04859.jpg ideas on what the item is, what was it used for and how was it used.

The squares in the background are 5mm

Thread: Motorbike gearbox fitted to a milling machine
09/02/2022 10:38:38

I have removed the bolt at the bottom of the kick start plate and the 7 screws around the edge of the gearbox cover..

Tapping the edge of the cover moves it only about 0.5 to 1mm.

Removing the large cap near the centre (see last photo) , there is a nut holding in a bearing. Is it this bearing that is stuck to the gearbox cover and stopping the cover from moving

Should I remove the nut hoping bearing will be released from the shaft and the gearbox cover will come off?

08/02/2022 14:54:54

The loose bolt has 8.8 M GSF on it.

There is the number 9-15471 (From Hopper's link I think it is a pre war MAC)

The gear lever returns to is normal position after changing gear.

I read Hoppers link on the gearbox which was very good if you know all about them which I don't.

Can I remove the outer screws only to remove the cover to get to the other end of the loose bolt?

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