|
Posted by Trevor Jones on July 21, 2008, 6:51 pm
Please log in for more thread options
etpm@whidbey.com wrote:
>> Got any sketches? I'd be interested in seeing the design.
>>
>> Cheers
>> Trevor Jones
>>
>
> Greetings Trevor,
> Sketches of the cross slide or of the rotary table fixes? I have
> drawings of the cross slide but am correcting them as I make the
> parts. When they are complete I'll post them to the dropbox.
> Eric
Sketches of the cross slide general layout and such.
Sketches or a rundown on the rebuild of the R/T would be nice too! :-)
I can wait.
If I have too. :-)
Cheers
Trevor Jones
|
|
Posted by on July 22, 2008, 11:25 am
Please log in for more thread options
wrote:
>etpm@whidbey.com wrote:
>
>>> Got any sketches? I'd be interested in seeing the design.
>>>
>>> Cheers
>>> Trevor Jones
>>>
>>
>> Greetings Trevor,
>> Sketches of the cross slide or of the rotary table fixes? I have
>> drawings of the cross slide but am correcting them as I make the
>> parts. When they are complete I'll post them to the dropbox.
>> Eric
>
> Sketches of the cross slide general layout and such.
>
> Sketches or a rundown on the rebuild of the R/T would be nice too! :-)
>
> I can wait.
>
> If I have too. :-)
>
> Cheers
> Trevor Jones
>
Well Trevor, I can describe the R/T changes to you pretty easily.
First thing I did was to take the whole thing apart. This left me with
the table separated from the spindle. After cleaning everything I
machined a groove in the underside of the table about 3/8" wide and
1/8' deep. I then filled this groove with silicon bronze by tig
brazing. After brazing the bottom of the table was faced flat and a
groove cut into the silicon bronze 1/8" wide and .094 deep. The bottom
of the worm gear was also faced flat. The spindle was then reattached
to the table, turned so that it was square with the table, the thread
on the end chased so that it was square, and then tapped for a
threaded insert. The body of the R/T was then machined inside: it was
bored for a bronze bushing to accept the spindle, grooved for a bronze
insert that the bottom of the worm gear bears on, and a register
turned on top that fits into the groove machined into the bottom of
the table. This register and groove makes a labyrinth seal as well as
a radial register. I lapped, with Timesaver compound for soft metals,
the bronze areas and checked with bluing to make sure that there was
proper contact of the bronze and cast iron areas. This is actually
running a little longer than I thought so I'll need to come back and
finish up.
Eric
|
|
Posted by Trevor Jones on July 22, 2008, 11:31 pm
Please log in for more thread options etpm@whidbey.com wrote:
> wrote:
>
>
>>etpm@whidbey.com wrote:
>>
>>
>>>>Got any sketches? I'd be interested in seeing the design.
>>>>
>>>>Cheers
>>>> Trevor Jones
>>>>
>>>
>>>Greetings Trevor,
>>>Sketches of the cross slide or of the rotary table fixes? I have
>>>drawings of the cross slide but am correcting them as I make the
>>>parts. When they are complete I'll post them to the dropbox.
>>>Eric
>>
>> Sketches of the cross slide general layout and such.
>>
>> Sketches or a rundown on the rebuild of the R/T would be nice too! :-)
>>
>> I can wait.
>>
>> If I have too. :-)
>>
>> Cheers
>> Trevor Jones
>>
>
> Well Trevor, I can describe the R/T changes to you pretty easily.
> First thing I did was to take the whole thing apart. This left me with
> the table separated from the spindle. After cleaning everything I
> machined a groove in the underside of the table about 3/8" wide and
> 1/8' deep. I then filled this groove with silicon bronze by tig
> brazing. After brazing the bottom of the table was faced flat and a
> groove cut into the silicon bronze 1/8" wide and .094 deep. The bottom
> of the worm gear was also faced flat. The spindle was then reattached
> to the table, turned so that it was square with the table, the thread
> on the end chased so that it was square, and then tapped for a
> threaded insert. The body of the R/T was then machined inside: it was
> bored for a bronze bushing to accept the spindle, grooved for a bronze
> insert that the bottom of the worm gear bears on, and a register
> turned on top that fits into the groove machined into the bottom of
> the table. This register and groove makes a labyrinth seal as well as
> a radial register. I lapped, with Timesaver compound for soft metals,
> the bronze areas and checked with bluing to make sure that there was
> proper contact of the bronze and cast iron areas. This is actually
> running a little longer than I thought so I'll need to come back and
> finish up.
> Eric
Thanks Eric!
Looking forward to it!
Souns like quite the kit build!
Cheers
Trevor Jones
|
|
Posted by on July 23, 2008, 4:33 pm
Please log in for more thread options wrote:
>etpm@whidbey.com wrote:
>> wrote:
>>
>>
>>>etpm@whidbey.com wrote:
>>>
>>>
>>>>>Got any sketches? I'd be interested in seeing the design.
>>>>>
>>>>>Cheers
>>>>> Trevor Jones
>>>>>
>>>>
>>>>Greetings Trevor,
>>>>Sketches of the cross slide or of the rotary table fixes? I have
>>>>drawings of the cross slide but am correcting them as I make the
>>>>parts. When they are complete I'll post them to the dropbox.
>>>>Eric
>>>
>>> Sketches of the cross slide general layout and such.
>>>
>>> Sketches or a rundown on the rebuild of the R/T would be nice too! :-)
>>>
>>> I can wait.
>>>
>>> If I have too. :-)
>>>
>>> Cheers
>>> Trevor Jones
>>>
>>
>> Well Trevor, I can describe the R/T changes to you pretty easily.
>> First thing I did was to take the whole thing apart. This left me with
>> the table separated from the spindle. After cleaning everything I
>> machined a groove in the underside of the table about 3/8" wide and
>> 1/8' deep. I then filled this groove with silicon bronze by tig
>> brazing. After brazing the bottom of the table was faced flat and a
>> groove cut into the silicon bronze 1/8" wide and .094 deep. The bottom
>> of the worm gear was also faced flat. The spindle was then reattached
>> to the table, turned so that it was square with the table, the thread
>> on the end chased so that it was square, and then tapped for a
>> threaded insert. The body of the R/T was then machined inside: it was
>> bored for a bronze bushing to accept the spindle, grooved for a bronze
>> insert that the bottom of the worm gear bears on, and a register
>> turned on top that fits into the groove machined into the bottom of
>> the table. This register and groove makes a labyrinth seal as well as
>> a radial register. I lapped, with Timesaver compound for soft metals,
>> the bronze areas and checked with bluing to make sure that there was
>> proper contact of the bronze and cast iron areas. This is actually
>> running a little longer than I thought so I'll need to come back and
>> finish up.
>> Eric
>
> Thanks Eric!
>
> Looking forward to it!
>
> Souns like quite the kit build!
>
> Cheers
> Trevor Jones
>
Well, here's some more. I have to back up a little. The first work
was done on the body was to surface grind the bottom and the right
angle surface to make them flat and square. After the inside work on
top was done I turned the body over to bore and face the bottom of
said bore for a thrust bearing. I used a needle type thrust bearing
along with two washer type races made for the bearing. I made a new
nut that clamps onto the spindle threads so that the preload could be
kept where I wanted it. The spindle was threaded in the lower part to
recieve an insert. This insert is threaded .532-24 on the OD , 3/8-16
and 10-32 on the ID. It's an inch long and the 10-32 thread is about
5/16 long with the remainder the 3/8 thread. The spindle is bored from
the other end for a morse taper center. The 10-32 thread in the insert
is for using a screw to push the morse taper center out of the table
and the 3/8 thread is for a clamping stud to be threaded in. The
original table clamp was a screw that threaded through the R/T body
and pressed against the worm gear. That threaded hole was threaded
1/4-28 and a zerk fitting installed. I machined an annular groove in
the table on center 1/8 wide and deep. Two 3/8 wide slots were
machined tn the body opposite each other and tapped 10-32 in the
bottom. These slots hold clamps that fit into the annular table
groove. After all the work so far done it was time to address the worm
assembly. Because the table position had shifted slightly I though the
worm might not contact the warm gear properly. As it turns out it was
so far out it wouldn't have contacted the worm gear properly before
any mods. So I bored the body to correct the worm center location and
bushed the bore back to size to accept the worm assembly. I made a new
split cotter to clamp the worm assembly and a new handle to turn the
screw which toghtens the cotter. Lastly I tapped another hole in the
handwheel opposite the existing hole so that an arm could be attached
to the handwheel effectively increasing the diameter of the handwheel.
This makes milling with the R/T much easier because of the increased
leverage. I did this to my 10 inch table and the 12 inch Troyke too. I
think that covers all the work I did to the thing. Now I'll never be
able to justify the time except that it was fun and the R/T is now a
fine tool and I know just how accurate it really is. The next mod is
to add an encoder to the worm assembly. I have the encoder and
readout. The encoder is a 900 line device. The R/T has a 72:1 gear
ratio. This means that with the encoder mounted to the worm and read
in quadrature the resolution will be 5 seconds. Probably not the
accuracy though. Hope you found this enlightening. When I get a new
digital camera I will take some pics and post 'em.
Eric
|
| Similar Threads | Posted | | Boxford Cross Slide | February 15, 2008, 7:27 am |
| Cross slide screw | December 11, 2008, 1:44 am |
| Cross slide, uneven wear. | January 23, 2008, 1:53 pm |
| rotary table | July 11, 2008, 2:50 pm |
| rotary table recommendation | May 26, 2008, 2:50 pm |
| 3 ph Welder from rotary convertor? | December 7, 2008, 1:25 pm |
| Need Info Myford Rotary Switch box pre-1980 | August 20, 2008, 12:44 pm |
| Myford Vertical slide | June 29, 2008, 11:28 am |
| Myford vertical slide anyone? (unashamed plug) | September 17, 2006, 3:29 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>>
>> Cheers
>> Trevor Jones
>>