Sightron parallax assist knob

[Stray8]

Recently started 3D modeling/printing and decided to create a knob to increase the leverage on the hard to turn 10-50x parallax. I know this has been produced in aluminum in the past due to other people having this issue. The markings on the knob also leave something to be desired so I put some marks that can be painted as well. I have attempted 3 drafts and so far draft 2 and 3 are perfectly functional and fit tight in the teeth on the knob. Draft 1 was too tight due to material printing dimensions needing to be adjusted. Also has a hole that spans the joint with recesses for a screw and nut to lock it on.

The drafts were printed in PLA with 200 micron layers and 20% infill. Ended up printing at 100.6-100.7 scale to get the fit right. Appears plenty strong for the job. If anyone is interested in the STL files let me know.

 

[dedogs]

a knob to increase the leverage on the hard to turn 10-50x parallax.

Will you be doing these for any other scopes, i.e. Nightforce, Leupold etc.?

 

[pittbull46]

Recently started 3D modeling/printing and decided to create a knob to increase the leverage on the hard to turn 10-50x parallax. I know this has been produced in aluminum in the past due to other people having this issue. The markings on the knob also leave something to be desired so I put some marks that can be painted as well. I have attempted 3 drafts and so far draft 2 and 3 are perfectly functional and fit tight in the teeth on the knob. Draft 1 was too tight due to material printing dimensions needing to be adjusted. Also has a hole that spans the joint with recesses for a screw and nut to lock it on.

The drafts were printed in PLA with 200 micron layers and 20% infill. Ended up printing at 100.6-100.7 scale to get the fit right. Appears plenty strong for the job. If anyone is interested in the STL files let me know.

Recently started 3D modeling/printing and decided to create a knob to increase the leverage on the hard to turn 10-50x parallax. I know this has been produced in aluminum in the past due to other people having this issue. The markings on the knob also leave something to be desired so I put some marks that can be painted as well. I have attempted 3 drafts and so far draft 2 and 3 are perfectly functional and fit tight in the teeth on the knob. Draft 1 was too tight due to material printing dimensions needing to be adjusted. Also has a hole that spans the joint with recesses for a screw and nut to lock it on.

The drafts were printed in PLA with 200 micron layers and 20% infill. Ended up printing at 100.6-100.7 scale to get the fit right. Appears plenty strong for the job. If anyone is interested in the STL files let me know.

 

[pittbull46]

would you sell one?

 

[Stray8]

Will you be doing these for any other scopes, i.e. Nightforce, Leupold etc.?

I don’t currently own scopes of those brands. It wouldn’t be difficult to change it for them, but without a knob to test it would be difficult to know if the print would fit correctly.

If you wanted to modify a file yourself though, I could get you an STL file that would be close from pictures/measurements.

 

[Stray8]

would you sell one?

I would, I’m still currently trying different outside shapes to make it easier to grip and final design may change. Also, I would hate to sell you one made out of PLA because it may deform if you left it in a hot car that got close to ~140F. I do plan on printing in a more heat stable plastic though.

 

[pittbull46]

I would, I’m still currently trying different outside shapes to make it easier to grip and final design may change. Also, I would hate to sell you one made out of PLA because it may deform if you left it in a hot car that got close to ~140F. I do plan on printing in a more heat stable plastic though.

I would be interested please let me know

 

[6MMsteve]

shoot me a pm when you get the R&D finished and a price if you don't mind, I'm interested. Thanks Steve

 

[Punkinslinger]

shoot me a pm when you get the R&D finished and a price if you don't mind, I'm interested. Thanks Steve

Me also, please

 

[JLT]

Piling on ... interested as well. I have more than a handful of SIIIs.

Nice work. Thanks!

 

[Stray8]

Would someone with an SIII 10-50 mind measuring the max diameter of their parallax knobs? I want to see if there is significant difference between individual scopes.

 

[pittbull46]

Recently started 3D modeling/printing and decided to create a knob to increase the leverage on the hard to turn 10-50x parallax. I know this has been produced in aluminum in the past due to other people having this issue. The markings on the knob also leave something to be desired so I put some marks that can be painted as well. I have attempted 3 drafts and so far draft 2 and 3 are perfectly functional and fit tight in the teeth on the knob. Draft 1 was too tight due to material printing dimensions needing to be adjusted. Also has a hole that spans the joint with recesses for a screw and nut to lock it on.

The drafts were printed in PLA with 200 micron layers and 20% infill. Ended up printing at 100.6-100.7 scale to get the fit right. Appears plenty strong for the job. If anyone is interested in the STL files let me know.

 

[pittbull46]

is this what you are looking for max dia. is 1.254

 

[Punkinslinger]

My max dia on two 10-50X 60 is 1.469 2-3 years old
My max dia on two 8-32 is 1.252 5-7 years old

 

[Stray8]

View attachment 1032479 is this what you are looking for max dia. is 1.254

What model scope did you measure?

 

[Stray8]

My max dia on two 10-50X 60 is 1.469 2-3 years old
My max dia on two 8-32 is 1.252 5-7 years old

1.468” is what my 10-50x measures so we are right on there

 

[Stray8]

Here are the current/final versions of the parallax knob extensions. I added teeth because the original didn’t have enough ridges if your hands were sweaty. The large version is ~3.2” diameter and makes moving the knob very easy. However I found it could possibly obstruct the rear of a left port, and this was with my high TPS rings. So, I made a smaller version that makes it ~2.5” for use with left loading ports or super low rings. Still a great improvement but not as much leverage as the large.

Also, the screw hole was eliminated from the designs because it is not necessary for a tight secure fit.

LARGE

SMALL

 

[Mozella]

Here's an option for those who don't have a 3 D printer. This side wheel is available on Amazon for eighteen bucks, but it doesn't fit my Sightron III. However, I enlarged the ID of the hub just a little bit using a Dremel tool and a cylindrical cutter.

It's not perfectly concentric, but the cut is on the inside so it doesn't show and it's a very low RPM device, so it need not be perfect. Just keep whittling away at the aluminum until it's large enough and then modify the rubber hub for a nice fit or toss the hub and wrap your scope knob with a couple layers of electrical tape, depending on the OD of your scope knob. It's pretty easy.

Later on a friend cut some for his scopes and some of my other scopes on a milling machine, but a lathe would be even better.

The wheel is pretty nice and it will be hard to beat the $18 price tag no matter what path you take.

 

[pittbull46]

What model scope did you measure?

SS111 8x32 didn't think they were dif

 

[Stray8]

Here's an option for those who don't have a 3 D printer. This side wheel is available on Amazon for eighteen bucks, but it doesn't fit my Sightron III. However, I enlarged the ID of the hub just a little bit using a Dremel tool and a cylindrical cutter.

It's not perfectly concentric, but the cut is on the inside so it doesn't show and it's a very low RPM device, so it need not be perfect. Just keep whittling away at the aluminum until it's large enough and then modify the rubber hub for a nice fit or toss the hub and wrap your scope knob with a couple layers of electrical tape, depending on the OD of your scope knob. It's pretty easy.

Later on a friend cut some for his scopes and some of my other scopes on a milling machine, but a lathe would be even better.

The wheel is pretty nice and it will be hard to beat the $18 price tag no matter what path you take.

View attachment 1032581

I haven’t seen that one, looks like it is a pretty good DIY option. Since people had shown interest I was going to sell them for $15 shipped with tracking once I get them printed in ABS. Could also do some custom diameters or hole patterns if requested. I will share the STL files for free any time though.