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Member postings for Philip Slater

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

Thread: Myford 254s tooling
25/07/2019 19:59:18

Hi thinking of getting a Myford 254s what size shank of tool could I expect to get into a quick change toolpost. Also anybody any idea on what budget I should be looking at.

Thread: Crabtree B15 3 phase Stop / Start switch
17/02/2019 08:53:01

Thanks for the replies. John, I happy playing with electricity but I'm guessing by removing wire from the coil and so reducing its resistance makes it a stronger magnet? I assumed, maybe wrongly, the 240v coils would contain more turns of wire. I'm obviously lacking in my theory knowledge.

Yes Les I've seen the NVO open switches and will maybe go down this path. At the moment I'm putting an emergency stop on the low voltage inputs to the VFD. I suppose it's the tight Yorkshire man coming out of me, never throw anything away. It would seem a shame to loose a bit of 1953 history.

16/02/2019 12:24:36

Spent 3 hours this morning stripping and cleaning the switch, interesting project. All sorted and dirty stop switch contacts all cleaned and operates great.

Only problem is it's a 415v switch which I'm trying to operate on 240v unfortunately there isn't enough pull on the electromagnet to pull the contacts hard on and the whole thing vibrates at 50hz. Looks like I'll be putting the thing in my box of museum bits unless somebody knows of a supply of 240v coils.

15/02/2019 19:41:51

Thanks for the circuit diagram Split pin, just checked my switch again and it looks like the stop push button contacts are u/s, they are not normally closed as shown. I'll try stripping it down tomorrow but it looks pretty sealed up. I've got nothing to loose. Thanks again.

15/02/2019 18:40:07

Hi I'm in the process of modifying / upgrading my Tom Senior M1 milling machine. I've got the new motor and have a new VFD to power it. I was thinking of trying to utilise the original Crabtree B15 Stop / Start switch to switch the 240 volt supply to the VFD, I'm aware I would need to modify it.

Striped it down today and can see the start contactor and the main coil but can't see how the stop function works. I would have thought the stop relay simply broke the coil circuit causing the main contacts to open but can't see how it does this.

I wondered if anybody had come across a similar problem.

Thread: Single phase verses 3 phase motor
09/02/2019 19:14:32

Preety conclusive then!! I hadn't thought of running the VFD beyond 50hz but as suggested you would have to be a bit careful doing this. VFD and 3 phase motor here I come then.

Thanks for the rapid respones

09/02/2019 16:49:21

Hi all

Not sure if this is a good place to direct this question or not but here goes.

I'm fairly new to model engineering and am in the process of building up a Tom Senior M1 milling machine to which I've grafted a Rambaudi vertical head. I now need to fit a motor to the vertical head and was looking at fitting a 1 1/2 HP type. I was going to go for a 3 phase motor with a VFD but it occured to me I could make the job a bit cheaper and fit a single phase motor.

Does anybody have any thoughts on this? I would think the 3 phase motor would be smoother running and I like the idea of a soft start but I can save the cost of a VFD if I go single phase.

Thread: Hi from North Lincolnshire
09/02/2019 16:33:58

Just before retiring 4 years ago I purchased my Myford Super 7 and slowly I've found more and more use for the lathe having purchased a part built 3 1/2" gauge live steam locomotive a year or so back. I've now built up a Tom Senior milling machine and hope this will come in useful as I get more into model engineering.

Thread: Tom senior M1 horizontal arbor
22/07/2018 11:57:56

Thanks Geoff thats a great help, it's all becoming a bit clearer now.

Phil

19/07/2018 21:52:29

Sounds good. I'll do the same

19/07/2018 19:22:38

Thanks Mike my drive is definately MT3, I'm thinking MT3 was the earlier version and INT30 came later. I have 4 old surplus arbours of varying lengths with INT30 tapers. The taper part appears to be a separate piece so I was going to remove the INT30 taper by destroying it then boring a soft end MT3 arbour (RDG sell them) and fitting it to the old 1" shaft. I was unsure if all the drive came through the taper or wether they used the 2 drive grooves on the output shaft of the milling machine. Looking at your pics it all the derive comes from the taper.

My home made vertical head (which is in a bad way) uses the 2 drive grooves for drive. Is that correct?

18/07/2018 13:21:52

Thanks i'm assuming the 2 grooves in the output coupling are used only with the vertical head and all the drive for the horizantal arbor comes from the MT3 taper which is secured by the drawbar.

18/07/2018 08:48:43

Hi I have recently acquired a Tom Senior M1 milling machine but haven't got the correct horizontal Arbor. Was wondering if anybody could supply a picture of the correct Arbor. I'm assuming it's a Morse taper 3 on the end and drives on this with a draw bar.

Thanks

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