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Member postings for Trevor Drabble

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

Thread: Newton Tesla Electric Drives
17/01/2018 18:49:18

JES , I have a Newton Tesla unit on my S7 and have never regretted it for a momen Regarding torque concerns at low motor speeds , I resolve any issues by simply reverting back to changing belts and increasing motor speed . NT intstructions make reference to not running the motor below 800 rpm for extended periods in order to avoid overheating . If you look on my album page you will find a chart I drew up to help me avoid any such problems . Hope this helps .

Trevor.

Thread: Centre punches/bench tools
17/01/2018 18:29:51

When I worked for James Neil (Eclipse ) we made the pocket scribers with either hardened or carbide points , and my two samples are still working well many years later . Perhaps things have changed now Eclipse is owned by a foreign company ?

Trevor .

Thread: Lathe stand to suit an ML7
17/01/2018 13:28:06

David , Just to throw a curved ball into the thread , may I suggest a lathe stand , item number 505177 from Axminster Power Tools ?

Trevor .

Thread: Lever/Rack tailstock preferences
19/11/2017 18:26:33

Steve , I have the rack attachment and wouldn't be without it now . It is much more sensitive than the standard barrel ( essential for smaller drills ) plus I continually use the friction -set depth scale . Had serious reservations at the high cost when bought it new from Myford Nottingham , but now , as I've said I wouldn't be without it .

Trevor.

Thread: Straightening brass beading
14/11/2017 16:09:50

Clive , Suggest you have a look at a pyro straightener at your local electrical distributors or on line . BICC do a reasonable one .

Trevor.

Thread: Made something useful at last
05/11/2017 16:44:27

Sean , Nice work . May I suggest you now put a nominal 3mm x 3mm slot along the full length of the bottom of the Vee in order to allow dirt and dwarf somewhere to go and also to allow any angular work to sit fully on the sides of the Vee , and so maintain an accurate register . Trevor

Thread: myford feet bolt dimention
05/11/2017 16:18:41

Garry , According to my manual , distance C from end of belt cover to first hole centre is 11 1\4" ( 286 mm ) , dimention D , distance between centres is 22 1\4" ( 565 mm) . Distance O from spindle to front mounting bolts centres is 2 9\16" ( 65mm) , and dimension N from spindlier to rear mounting bolts centres is 2 1\16" (52.5 mm) . Distance L from spindle to rear of belt guard is 13 1\2" (343mm) and distance M from spindle forwards to front of crosslide handle is 14" (350mm) maximum. Holding down bolts are 5\16" (8mm) diameter . Hope all above is useful . Don't forget to allow for full opening of guards . If you PM me your details I will send you this original Myford soft back book . Trevor.

Thread: About tap & die's
05/11/2017 15:41:58

Karl , sent you a PM.

Trevor

Thread: How to straighten a brass handle.
30/09/2017 16:55:47

My method would be to attach two longish flats , as per MG , with one held in a vice , and the other having a weight at its end . I would then apply a strong flame to the inside of the curve for a short while , and then leave the combination of the contracting metal and weight to SLOWLY remove the be d . Repeated applications may be neccessary .

Thread: Can titanium be soldered to brass?
28/09/2017 13:42:37

Further informationon brazing options here at Johnson Matthey - Brazing Filler Metals - Ti-Flo Filler Metals.

Trevor .

Thread: DC/DC voltage conversion
08/09/2017 00:21:56

Robin , Would suggest you look at the voltage regulators from Component Shop .

Trevor .

Thread: Ideas on how to repair a cast iron T slot
11/08/2017 21:58:15

NDIY , For cost of postage , I have some CI rods and flux available I have used with oxy-acetylene for use by your welder if reguired .

Thread: Direct Marketing Fail
11/01/2017 15:41:35

MG , BRILLIANT

Trevor.

Thread: Unusual Engineers Block?
08/01/2017 22:44:55

Marc , Good idea . Sorry , but can't remember grade or quantities for various sized chucks . From memory it was quite light . More important though , is not to over-fill it because the internal volume in which the oil can move is very limited . This fact coupled with the close tolerances can result in the excess oil forcing the frame , and consequently the operating handle , back from the horizontal right hand position back up to an angle of about 25/30 degrees .

08/01/2017 20:13:41

Mark , Depending on the source of the wear , yes it is possible , though as far as I am concerned , not advisable . Depending on age of chuck , the chuck is assembled using a combination of screws ( to maintain integrity ) and dowels ( to maintain relative locations) between the steel top plate , aluminium frame ( non-magnetic ) and the steel base plate . Most regular problems used to be caused by the oil leaking out and so needing excessive force on the handle and it's internal eccentric and connecting link to move the frame which carries the magnets . This in turn lead to excessive wear in the reamed hole in the aluminium frame carrying the handle shaft , which then leaked more oil and also prevented full and correct movement of the frame to the detriment of the chucks performance .

I obviously have no experience of Eclipse's present proceedures , but when we received repair items , we fully stripped them and replaced any worn parts . That included fitting new end and back stops on chucks which were returned without any . All were then de-magged and fully re-magnetised using special kit we had developed by Eclipse's chief designer Billy Bower and all built internally .

08/01/2017 19:01:27

Martin , Wish I'd got a pound for everyone of these I've assembled and ground up . These Adapter Blocks were normally supplied as matched ground pairs in a polished wooden box to protect them . I started my apprenticeship in August 1965 in Magnet Division of James Neil.

If a thin workpiece is placed across the chuck pole piece and the body of the chuck top plate , the throw of the flux is such that it passes straight through the work piece and so in effect only holds it in 2 places per line of flux .The purpose of the adapter block is to shorten the path of the magnetic flux such that all the flux stays within the work piece , and thus holds it much more securely . This shortening is achieved by using alternating laminations of magnetic (steel) and non-magnetic ( brass) materials . Similarly , brass rivets are used so as not to short-circuit the lines of flux .

For the block to work effectively it is important that both the chuck top plate and the working surfaces of the adapter block are finely ground and without imperfections . Similarly , as has already been indicated , positioning and orientation over the chuck pole piece and top plate are crucial.

We also offered far better solutions to the problem of grinding thin work pieces in the form of a far more complex structured Fine Pole Top Plate . This was available either as a supplementary top plate ( again in a protective polished wooden box ) which in the main removed the chances of poor positioning by the user , or was factory fitted in place of the standard top plate on final assembly .

Thread: An oil gun that works?
02/01/2017 17:01:16

Andrew , My vote is for either the Lumatic OLGH/CV , or if funds allow , the Wanner 30960 . Neither will be cheap these days . Assume they available from any good Lubrication Engineers or maybe Cromwell Tools .

Trevor .

Thread: Original Myford raiser block queries
27/12/2016 16:20:49

Stokes Paints in Sheffield ( 0114 258 9595 ) used to produce very good machine enamel in small quantities to your choice of colour . No connection to company other than very satisfied passed customer .

Trevor .

Thread: Metal bluing parts of the lathe
22/12/2016 13:05:15

Gareth , As an alternative may I suggest you consider a company called BLACK-IT on www.black-it.co.uk and 01758 730356 . I have no connection with the company .

Trevor .

Thread: Stuart 10V Hiccup!
21/12/2016 18:06:34

Martin , I have some 1/4" square section cast iron for use in welding Ci with oxy-act. You are welcome to a sample piece if it helps . If you PM me your details I will drop you some in the post .

Trevor .

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