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Posted by John Stevenson on March 29, 2008, 5:59 pm
Please log in for more thread options On Sat, 29 Mar 2008 21:50:59 -0000, "Ian Phillips"
>
>>
>>>I need to make several 'Top Hats' out of stainless steel, below is a sort
>>>of
>>>cross section in my first attempt at ascii art.
>>>
>>>The part is about 45 diameter and 45 long and will have a wall thickness
>>>of
>>>1.5mm thick. The flange (brim) is 3mm thick and 48 diameter.
>>>
>>>As 50mm barstock will not pass through the headstock of a 5" Boxford I
>>>have
>>>though about buying cut blanks, gripping the OD in the 3 jaw and fully
>>>machining the bore. Then machining the OD by holding the part on some sort
>>>of mandrel. (The inner and outer concentricity need to be within 0.2mm or
>>>so)
>>>
>>>My dilemma is trying to decide how to hold the part on the mandrel (which
>>>I
>>>don't want to take out of the chuck until I've made all of the parts.
>>>
>>>I have thought of making an expanding mandrel which is somehow activated
>>>through the headstock spindle but it seems overcomplicated
>>>
>>>
>>>Thanks in advance for any suggestions
>>>
>>>Ian Phillips
>>>
>>>
>>>
>>>
>>>llllllll
>>>llllllll
>>>lllllllllllllllllllllllllllllllllllllllllllllllll
>>> llll
>>> llll
>>> llll
>>> llll
>>> llll
>>>lllllllllllllllllllllllllllllllllllllllllllllllll
>>>llllllll
>>>llllllll
>>>
>>
>>
>> What lathe and what type of spindle nose ?
>> --
>> Regards,
>>
>> John Stevenson
>> Nottingham, England.
>>
>
>
>
>1970's AUD 5" Boxford, standard screwed nose.
>
>Ian
>
In that case as you can't use expanding 5C mandrels then your best bet
is a set of soft jaws and turn down so you can hole on the inner
diameter which you turn first.
If in stainless get sawn blanks, let them cut them and wear their saw
out <g>.
--
Regards,
John Stevenson
Nottingham, England.
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>cross section in my first attempt at ascii art.
>
>The part is about 45 diameter and 45 long and will have a wall thickness of
>1.5mm thick. The flange (brim) is 3mm thick and 48 diameter.
>
>As 50mm barstock will not pass through the headstock of a 5" Boxford I have
>though about buying cut blanks, gripping the OD in the 3 jaw and fully
>machining the bore. Then machining the OD by holding the part on some sort
>of mandrel. (The inner and outer concentricity need to be within 0.2mm or
>so)
>
>My dilemma is trying to decide how to hold the part on the mandrel (which I
>don't want to take out of the chuck until I've made all of the parts.
>
>I have thought of making an expanding mandrel which is somehow activated
>through the headstock spindle but it seems overcomplicated
>
>
>Thanks in advance for any suggestions
>
>Ian Phillips
>
>
>
>
>llllllll
>llllllll
>lllllllllllllllllllllllllllllllllllllllllllllllll
> llll
> llll
> llll
> llll
> llll
>lllllllllllllllllllllllllllllllllllllllllllllllll
>llllllll
>llllllll
>