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Member postings for Mark P.

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

Thread: WM250 thread cutting
23/09/2017 13:21:47
Thanks Jason, I thought I had set it up correctly, I think I may have a longer banjo fitted! I suppose I could machine a bit off the top of my banjo.
Regards Mark P.
23/09/2017 12:55:53
Jason, I have the 50T on the right hand side ie next to the headstock with the 45T on the left, the 30T is in contact with the 50T the 45T gear is in contact with the 85T leadscrew gear have a gap of 4.5-5mm between the 30T and the spindle gear!
Mark P.
22/09/2017 15:13:11
It appears like that in my photo but the 30T is being driven by the 50T gear with the 45T in front of it. Not much a photographer.

Mark P.
22/09/2017 14:01:17
Thank you chaps, job done. This is what I get when I set up as per the charts http://www.model-engineer.co.uk/albums/member_photo.asp?a=43809&p=766181 the banjo contacts the head stock spindle.

Mark P.
22/09/2017 11:54:32
Thank you John, couldn't understand why 26TPI was not listed on the plate or in the manual. Maths have never been my strong point.

Mark P.
21/09/2017 18:55:12
http://www.model-engineer.co.uk/albums/member_photo.asp?a=43809&p=766112
Jason.
21/09/2017 18:22:21
Jason, yes it is a 3mm pitch leadscrew. I've pushed the banjo as far to the left as it will go but the 30T gear will not contact the spindle gear, will try the 60T gear tomorrow. John mine is 2008. Also I could do with cutting 26TPI threads as well it will do threads either side but not 26!!
Thanks Mark P.
21/09/2017 16:45:57
Mick B1, just had a look at the chart and it goes from the top-
H 30
45-50
85-H (leadscrew).
H is a spacer. Think the WM250 is different to the 250V.
Mark P.
21/09/2017 16:37:07
Jason,yes I have but the 30T gear doesn't contact the gear on the spindle. It's not on an eccentric pivot at the bottom is it?
Mark P.
21/09/2017 14:30:31
No Les the spacer is for locking the 30T gear to the 'banjo' spindle.The 30T gear drives the 50T wheel from the headstock.
Mark P
21/09/2017 13:49:57
Hi all, I have been trying to set my WM250 lathe up to cut a 20TPI thread. I fitted the change wheels as per the chart supplied ie starting from the top spacer,30T driving a 50T with a 45T on the outside driving an 85T on the leadscrew with a spacer on the inside. The problem is that the 30T gear is no where near the headstock gear. Am I missing something fundamental? The lathe is the metric one.
Regards Mark P.
Thread: Pros and cons of ac motorcycle lighting.
12/09/2017 15:26:53
Thanks Tim, well that's food for thought then. I will be fitting a battery so I may be better off running my leds from the dc side.
Mark P.
12/09/2017 15:06:39
Thanks Tim, my alternator has anoutput of 12v 65w of regulated ac, so I was hoping to use leds for head and stop an tail. The headlight will be a 6w led with a high and dip. I assume ohms law works with leds?
12/09/2017 14:37:35
Thanks for the reply Dave, the power for them is regulated ac, putting a rectifier in the circuit presents no problems I'm guessing that a 1n4004 would do the trick?
Mark P.

Edited By Mark P. on 12/09/2017 14:40:20

12/09/2017 13:57:23
As an afterthought there is a circuit diagram of the cdi/alternator in my album under my Triumph.
Mark P.

Edited By Mark P. on 12/09/2017 13:57:54

12/09/2017 13:55:05
Well I have almost decided to go for the electrex world kit One question though will 12v led headlight bulbs work on ac? I have been playing with a single 12v led and it appears to work ok on ac, so I assume that the headlight bulbs will?

Mark P.
05/09/2017 18:47:01
Tim, some of the thunderbirds were coil and battery ignition with a distributer and some with a mag (lucas K2F) unfortunatly the mag points revolve with the armature making conections tricky. I do have other options to look into.
Mark P
05/09/2017 17:36:05
Hello Tim,I have a very big electrolytic (32000 uf at 48v) as I said I'm still at the planning and costing stage.
Mark P.
05/09/2017 16:58:18
Tim, I am still at the planning stage yet and have seen other systems all come complete with regulators and rectifiers. I suppose I don't need a 210w system as I only intend to have lights and a horn and no indicators(but I would like a good headlight). As for ignition the jury is still out on getting the mag overhauled. If I go the electronic route there are quite a few choices but I may need a small battery just for the initial starting.
Mark P.
05/09/2017 15:22:29
The thing is at the moment my bike a 1957 650 Thunderbird has no electrical system apart from a suspect lucas magneto. I have a choice of getting the mag rebuilt (about ?350) and buying a 210w alternator and a regulator/rectifier (?200),or I can get an intergrated alternator with a self generating electronic ignition with all the bits for ?275. This uses ac for lighting but dc for battery charging, the drawback is the alternator output is only 65w.
Mark P
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