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Member postings for Frank Dolman

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

<< First < Prev 1 2 3 4 5 6 Next > Last >>
Thread: Chain Making
23/05/2010 12:29:57

     Not long ago, we all got a catalogue from Expo.  There is some chain
   in there, page 82
Thread: Castings
23/05/2010 12:23:05

     My memory of Tigers lacks precision and my knowledge of lost
   wax is minute but it does seem to me that some contributors have
   failed to grasp the size of these track links.  Please Tigerman, could
   we have an indication.  Then again do you want them cast in steel    or
 iron?  It seems to me that iron castings would not survive very long.
     You must be expecting the vehicle to weigh about 1 ton.
Thread: ED Racer 'times two'
22/05/2010 10:43:15

     Ramon, both threads have been exciting and awe inspiring.  Not least
   because of your speed.  Quite delighted at your success.
Thread: How close can I get? Indexable turning inserts....
16/05/2010 16:35:09

     www.oldengines has shown me pictures and descriptions of Coventry
   die heads, and all is much clearer.
     Ian, the electricians diestocks that I mentioned having seen were in
   fact very close relations to the Coventry die head.  The chasers that I have
   seen being used on a screwcutting lathe cut a lovely thread in brass in
   one pass.  I have not the slightest idea why they were used in preference
   to a tailstock die holder.
16/05/2010 00:51:54

     Ian   Thanks for info.  I had heard about the hand chasers the Old Boys
   used to use, just plunging them into the work and letting them generate
   their own pitch!  Can't help feeling that in those days, trying to start in ones
   old age without any practical instruction would have been much more
   difficult than it is now.
 
     Rob   Thanks for comments and particularly for the pretty pictures.  You
   confirm what I had gathered from the catalogue.  I now have to find out
   about the Coventry Die Head.  A happy half-Sunday on the web but not
   until after the Grand Prix!
    
15/05/2010 13:10:01

     Don't bother!  I have looked at a catalogue of indexable tools and I see
   a range of what I would call "single tooth chasers".  The catalogue didn't
   call them chasers at all.
     Sorry if I have caused you to start head scratching over how to reply.  Many
   thanks anyway.
15/05/2010 11:36:50

     I hope in due course to become a beginner, but I have not learnt enough
   yet.  I find that it is useful for me to chase up anything I see that I do not
   understand and this thread is a good example.
     The "thread chaser" that I know is a lathe tool like a short bit of saw blade
   that is used just like an ordinary tool in screwcutting, except that the thread
   can be cut all in one pass ( or nearly ).  This thing will do any diameter but
   only the pitch and thread form that it is made for.  The other thing that I have
   heard called a chaser is the interchangeable cutting insert that goes in the
   enormous stocks used by electricians for threading conduit.
     What puzzles me is how either of these can be "indexable".  Is there
   another kind of chaser that I don't know about?
     If its too complicated to explain on here, could I please be directed to a
   learned tome?
Thread: ED Racer 'times two'
30/04/2010 23:06:34

 
     The warning on the washing soda is to deter repeated cleaning of
   ali saucepans with it.  The effect on a saucepan is, of course, very
   attractive.  Never were pans so clean!  After half a dozen washes, they
   become pitted and a few washes later, holes appear.
 
 
     You are, we hope, only going to etch once.  Your workpieces will not
   be holed, furthermore you are going to wash them carefully afterwards.
   Imagine the effect on a saucepan put away in the cupboard with a bit of
   soda solution left in the bottom.
Thread: Artillery
26/04/2010 08:28:31

     Absolutely super!  I can't express my delight and admiration.
Thread: Do you get what you pay for ?.
24/04/2010 11:47:49

     I have read somewhere that carbon steel taps are fine for use by hand
   but since the thread is sometimes not quite co-axial with the shank, they
   are a bit dodgy in a machine.  It seems to me that this trouble would be
   more serious with a little (like M3) tap, because it would be percentage
   error that would lead to breakage.
     I can't claim enough experience to say that this anything better than
   surmise.
Thread: Pop-up for digital.
22/04/2010 15:48:54

     I have just read six forum posts and so have been afflicted
   with six views of our own pop-up.  We are supposed to be all
   on the same side.  Once would be enough.  Shut it.
Thread: Plated Morse taper
21/04/2010 11:00:59

     Under another thread, John Coates asks what people think
   of a boring head he has found offered on the web.
     Going on the picture, it seems to have a chromium plated
   Morse taper shank.  In my very limited experience I have not
   seen one before.  Is it a good idea or a very bad one?  Could
   those who know please tell us?
Thread: Dilemma - neither lathe nor mill working
20/04/2010 10:56:29

     www.emkaysupplies.co.uk stock nine lengths of hex socket grub
   screws in 1/4 BSW. They have always supplied me quickly and
   accurately. No other connection. Prices good for very small numbers
   a bit fierce if you want a lot!
Thread: X2 type mini mill PCB speed control
19/04/2010 09:15:23

     On circuit boards that I have made myself, I have always used Holts
   'Dampstart' from Halfords because it is so easy to get..  I now have a
   Maplin next door to Halford, so the next can will be the right stuff.
     I have always been careful to mask things like pots and edge
   connectors which have contacts open to the spray because I suspect
   that you could easily get a joint that works well when first done but
   after a tiny movement from vibration or temperature change,
   becomes unreliable.
Thread: To Web Master
19/04/2010 01:55:50

     The thread ' Tap Magic'  is obscured by the ads
Thread: 2 questions - threading silver steel; tightening bar in the chuck
17/04/2010 00:35:47

     At the risk of going even further off-post, I would be interested to hear from
   Meyrick whether he has had a chance to do a 'forensic' on his old bearings. It
   seems to me that they must have been well made of bad material since they
   performed very well but had a short life.  Perhaps some Icelandic dust got at
   them
Thread: Cutting glass tube to length
16/04/2010 18:38:05

     When flame polishing, the flame will, unless prevented, run up the tube and
   brown you off.  Plug the 'cold' end of the tube to stop this happening.
Thread: Anodising
29/03/2010 13:11:44

     I worked for ten years in the lab as a wet-bench chemist.  My advice to expert
   machinists is to avoid the use of caustic soda if you can.  The same goes for
   strong acids.
     If you can't avoid them, OK but watch out.  As Mgj says, use protection and not
   just for the very vulnerable eyes and hands, but for all of you.
28/03/2010 11:03:46

     Caustic soda is nasty.  Washing soda is much less so and for this reason
   to be preferred.  Dissolve as much of the washing soda crystals as you can
   in warm water then add just a little extra water for luck.  The resulting solution
   will etch the ali very effectively but more slowly than caustic.  You can give it
   a bit of encouragement with an old toothbrush, to get into corners etc.,
   without endangering the flesh on your bones.  This strong washing soda
   solution is not harmless but it is at least manageable.  Caustic is nasty.
     As with caustic, rinse well under a running tap and then inspect.  Dry with
   a hair drier and put in a polythene bag to keep grease off until needed.
Thread: Thread dial indicator
23/03/2010 21:44:10

     Well done, mgj!  You are right, of course
                                       Regards
<< First < Prev 1 2 3 4 5 6 Next > Last >>
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