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Member postings for Deril

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

Thread: What Did You Do Today (2016)
21/10/2016 21:02:54

An interesting project,

Helpful information for designing and making internal gears is included in booklet 4 (of 6) on gearing written by F. Whiteley and published in 1951 by the A.E.S.D.

Sixteen pages are devoted to the subject.

They open with :- "A most common error made in connection with the design of internal spur gears is to accept the rather misleading statement made in many text books that all dimensions for internal gears may be found by using the same formulae as those for external spur gears"

Thread: Morse Taper Removal
17/12/2011 19:49:16

There is an alternative to blows at the drawbar.
Generally some form of extraction may be arranged at the work end of the taper.
For a collet holder with a closing nut a simple piece of tube round the holder between the nut and the quill will allow easy extraction by tightening the nut after the collet has been removed and the tube fitted.
For tools such as drill chucks and boring heads on morse tapers there is often enough unused length of taper outside the housing that a very short length of screw thread- from a salvaged water fitting- may be super glued on just clear of the housing.
A thin nut from the same salvage again allows easy extraction
 
Thread: Chester Mini Mill - X2?
19/07/2010 11:12:48
For John S
 
After looking at the Les J info I think the output of the transformer should be 15V as it is followed by the voltage regulators for 12V. We will see.
 
I wonder if the regulator shown on the schematic as KA9712 has the 9 and 7 transposed?  
18/07/2010 20:14:39
Many thanks for all the interest.
In answer to several of the queries :-
The mill is 7 years old and has given very good performance.
There is a transformer, the board is double sided, the mosfets are sound and it is the primary which is dud.
My other person knows what he is doing.
My own understanding of electronics is just one of interest and quite shallow but as with most things in this hobby we like to persue problems the hard way rather than the easy replacement we could do so easilly.
The lettering on the transformer could very well be the board designation for which it was destined.
The pin placing differs from any of those shown by Farnell, Rapid.RS or Maplin.
They are on the same basic grid as the3VA (not the 6VA) i.e 25x20 with the two inputs spaced at 20 and the output three at equal spacing on the other 20 leg.
I think the approach now is to use a Rapid chassis mount 88-3416 as close to the board as sensible and see if this is the required fix.
The posts by John S have been most interesting and useful and now the ref.-
 X2 controller provided by Les J adds to my understanding.
Regards to all. 
17/07/2010 19:41:54

I am advised the transformer has open circuited causing failure of my mill to work.
 
The numbering shown on the transformer is :-  FT3515-220-14DP
 
If anyone can suggest where a replacement for this component may be
 
obtained I would be most grateful. 
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