Seitz 3mm to 4mm lookin for advice please.

[ChuckW]

Hello Gentlemen I looking for advice please, I have a older Seitz jeweling tool aluminum I believe, it has a 3mm stump post hole. I would really like it to fit 4mm post so i can use my set of 4mm's with it out having to purchase other set of 3mm stumps. Is it possible? Can I drill/mill it out to 4mm? As anyone done this? Any help would be appreciated . I was told there is an adapter but I have not been able to find one. Thanks in advance!

[ifibrin]

If you have a Seitz jeweling tool with a 3mm hole on the base, it’s going to be very difficult to drill out the 3mm hole to 4mm accurately. If you did try to do this, you would have to ensure that your new 4mm hole on the base is perfectly centered to the spindle of the jeweling tool; if the newly drilled hole is a bit off, it would render your entire tool worthless. I can’t see how you can do this drilling without access to some pretty expensive tools.

On the other hand, if you were to make a new metal table as a base, with a 3mm plug on the bottom, and a 4mm hole on the table face for your stump, this would be a lot more feasible. The only drawback would be that this table insert/adaptor would reduce the working distance between spindle and stump.

In both cases, ensuring all holes and/or plugs are exactly 3.99mm or 4.01mm is critical for fitting, so you would have to have some pretty precise tools…

 

However, if the 3mm hole is on the spindle, you can easily buy a replacement spindle with 4mm hole.

I believe that the Horia spindle sold on Cousinsuk can fit the Seitz tool. However, you have to check with other members on this for confirmation, if the Horia and Seitz spindles are interchangeable, especially with regard to the head and overall length of the spindle.

Another possible issue is that the hole on the Seitz tool for the spindle has been known to vary slightly by up to 0.01mm, depending on the age of the Seitz tool. This could potentially affect whether the new Horia spindle will fit into the Seitz tool.

 

In other words, a Horia spindle may not fit your Seitz tool (depending on its age), as the new spindle diameter may be marginally larger.

It may also be cheaper and more economical to buy a second hand Seitz 4mm spindle, compared to a new Horia spindle.@nickelsilver may be able to advice you on this!

Edited September 24, 2022 by ifibrin

[ifibrin]

If you decide to take a gamble on a replacement Horia spindle fitting your Seitz tool, the Horia website does sell them in a variety of lengths, so you might want to measure the length of the original Seitz spindle in your tool.

Edited September 25, 2022 by ifibrin