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Denford 280 Synchro lathe
Posted: Thu 31 Jul , 2014 13:04 pm
by rpwilson
Just to be absolutely certain , before I start cutting gears for a metric/imperial translation set, for my 280 Synchro, c 1980, are these gears 16DP, 20PA? That's what I understood them to be, but they seem to mesh very well with some 16DP gears off my Raglan Little John, which are known to be 14.5PA, and the general wisdom seems to be that 20PA and 14.5PA gears don't run well together.
Richard Wilson
Re: Denford 280 Synchro lathe
Posted: Thu 31 Jul , 2014 20:33 pm
by rpwilson
Having spent the afternoon cutting out a template copy of the quadrant needed for translation gears, offering it up to the machine and discovered that no way was anything fitting using 16DP gears, I've finally checked out the translation gear part numbers against the drawings available on the forum, and discovered that while the 'normal' end drive change gears are indeed 16DP, the ones comprising a translation set, either metric -imperial or imperial-metric are 18DP! Good job I hadn't ordered the 16DPO 20PA cutters I thought I needed. I had ordered the metal for the gears, but that just means a bit more swarf.
Richard
Re: Denford 280 Synchro lathe
Posted: Fri 01 Aug , 2014 10:01 am
by Andy B
Richard,
Have you made a pattern for casting the new quadrant, or are you fabricating it?
I got as far as starting to make the special studs as a turning exercise, but the rest of the job to make a transposing set for my 280VS is well down my 'tuit' list unfortunately!
Andy
Re: Denford 280 Synchro lathe
Posted: Fri 01 Aug , 2014 12:04 pm
by rpwilson
I'm making the pattern at the moment. I cut out a template of the shape, assuming 16DP gears, offered it up and discovered that it was too big for the machine. Then I discovered that they were 18DP gears, and made a new template. That fitted, so I'm on with the pattern. Theres a bit of guesswork because I cant find a drawing showing the metric/imperial quadrant, so I'm assuming its the same as the imperial/metric one, with the gear centres tweaked to suit.
I've realised that the translation gears, 18DP, 3/8" thick, 9/16" bore are the same as Boxford gears, but a check on ebay suggests that its still cheaper to machine my own, and anyway, some of the Denford ones don't seem to have tooth numbers available in the Boxford range.
Richard