|
Posted by on July 21, 2008, 7:09 pm
Please log in for more thread options
On Mon, 21 Jul 2008 14:14:51 -0700 (PDT), woodworker88
>Thanks all very much for the advice. I talked to another machinist at
>work today and we decided that a single point flycutter seems to be
>the best bet. I have that book on order as of 15 minutes ago.
>
>Thanks
>Michael
Greetings Michael,
I think you'll find that making a worm and using that to make the worm
gear will be the easiest and best way. The book you ordered will make
that obvious to you. I have made worm gears using a tap as the hob
too. Using a high spiral tap is the best way to go. The tap, acting as
the hob, pulls the worm gear around so no indexing head is needed. The
method I used was to hold the tap shank in a collet and the gear blank
is mounted horizontally on a holder which in turn is clamped in an
Aloris toolholder. The gear blank is set on the spindle centerline and
is free to rotate. Then the gear blank is fed into the spinning tap
with the cross slide. Since you are making a brass worm gear you might
be able to get away with using an un-hardened steel hob.
ERS
|
|
Posted by Kelly Jones on July 21, 2008, 8:52 pm
Please log in for more thread options
> Thanks all very much for the advice. I talked to another machinist at
> work today and we decided that a single point flycutter seems to be
> the best bet. I have that book on order as of 15 minutes ago.
>
> Thanks
> Michael
Mike:
please post pictures and keep us up to speed as you progress through this
project.
thanks
|
|
Posted by woodworker88 on July 22, 2008, 12:20 am
Please log in for more thread options >
>
> > Thanks all very much for the advice. I talked to another machinist at
> > work today and we decided that a single point flycutter seems to be
> > the best bet. I have that book on order as of 15 minutes ago.
>
> > Thanks
> > Michael
>
> Mike:
> please post pictures and keep us up to speed as you progress through this
> project.
> thanks
Will do
|
|
Posted by Don Young on July 21, 2008, 10:06 pm
Please log in for more thread options
> Thanks all very much for the advice. I talked to another machinist at
> work today and we decided that a single point flycutter seems to be
> the best bet. I have that book on order as of 15 minutes ago.
>
> Thanks
> Michael
Measure carefully as a lot of gears, especially worm gears, are not made to
diametrical pitch sizes.
Don Young
|
|
Posted by F. George McDuffee on July 21, 2008, 11:56 pm
Please log in for more thread options On Mon, 21 Jul 2008 21:06:11 -0500, "Don Young"
>
>> Thanks all very much for the advice. I talked to another machinist at
>> work today and we decided that a single point flycutter seems to be
>> the best bet. I have that book on order as of 15 minutes ago.
>>
>> Thanks
>> Michael
>Measure carefully as a lot of gears, especially worm gears, are not made to
>diametrical pitch sizes.
>
>Don Young
>
========
Because DP measures number of teeth per diameter in one sense,
and the circumference and the diameter are related by PI
[3.1416....] with a worm/wormgear set you can either have a DP
[or module] with a whole number like 20 or 22 DPI but a worm with
an "odd" thread, or you can have a worm with a standard whole
TPI but the worm gear will have a funky DP/module. This is the
reason for the strange thread pitches that the DP/module
gears/settings for your lathe produces so that you can make worms
that will mesh with standard DP/module gears. If you have a
genuine acme thread lead screw the gear will have a 14-1/2 degree
PA, but this is not a given.
Law's book goes into this in considerable detail and how to
calculate a change gear setup for a DP/module thread [have lots
of change gears]
I continue to be amazed at the quality/sophistication of work
exhibited by these old machines.
Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?
Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).
|
| Similar Threads | Posted | | worm gear WINCH "worm slop" problem (is something missing?) - MPEG *movie* posted to illustrate... | July 7, 2007, 1:55 pm |
| Where to get 127 tooth change gear for SB 9? | November 23, 2007, 10:33 am |
| Worm gear fabrication help please | April 5, 2007, 12:24 pm |
| Worm Gear Size? | September 19, 2007, 3:09 pm |
| worm gear cutting success | July 11, 2006, 7:15 pm |
| DRIVE GEAR & WORM question | September 9, 2007, 7:52 am |
| Circular saws , worm drive , hypoid gear | December 6, 2006, 3:16 pm |
| worm gears | March 28, 2006, 9:40 pm |
| Chip per tooth for end mill | February 18, 2008, 11:02 pm |
| cutting a worm on the minilathe | February 23, 2008, 5:20 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>work today and we decided that a single point flycutter seems to be
>the best bet. I have that book on order as of 15 minutes ago.
>
>Thanks
>Michael