Search found 221 matches

by DarkHorse
September 27th, 2015, 11:13 pm
Forum: Layout Advice
Topic: Ebonite Bowler ID shocked me
Replies: 11
Views: 1939

Re: Ebonite Bowler ID shocked me

I recently went to a ball demo with new gear from all major manufacturers. I've been using 3/8" Forward in my thumb, with a RF span that is 3/16" longer than MF. Demo balls typically have 1/4" Reverse in the thumb, and equal span lengths. Every ball I threw felt like garbage: they all released early...
by DarkHorse
September 26th, 2015, 4:40 am
Forum: Ball Talk
Topic: Damaged ring finger. What are my options?
Replies: 13
Views: 2610

Re: Damaged ring finger. What are my options?

When you say they "adjusted the insert for a better fit," could you be more specific?
Did they just change sizes?
Did they change pitches? Do you know the original pitches?
by DarkHorse
September 26th, 2015, 4:26 am
Forum: The Pro Shop
Topic: my YETI... what happened?
Replies: 8
Views: 501

Re: my YETI... what happened?

I noticed this "chunk" when I first drilled the Motion Hole.
I have no clue what it is, but it's close enough to the weight block that it may have been a kind of stand during the pouring and manufacturing process.

I did plug the Motion Hole and redrill, but not because of that piece.
by DarkHorse
September 11th, 2015, 11:11 pm
Forum: The Pro Shop
Topic: New drill press
Replies: 5
Views: 532

Re: New drill press

If you only have 4 inch or 4 3/8 stroke won't you have to remove the ball to change drill bit sizes ? My Rockwell has a 6 inch stroke and leaves very little room to spare to get the bit in and out with the ball mounted and still drill holes deep enough for slugs and changeable thumbs. 2 separate is...
by DarkHorse
September 11th, 2015, 4:17 am
Forum: Layout Advice
Topic: What causes axis migration
Replies: 6
Views: 487

Re: What causes axis migration

I think "Both." I'm thinking that the core seeking a stable state is what causes the precession. It's just like a spinning top, except a bowling ball won't fall over. In the second link, the author points out that placing the Pin in a stable position (on the PAP, PSA, or 6-3/4" from the PAP for Sym)...
by DarkHorse
September 11th, 2015, 3:58 am
Forum: The Pro Shop
Topic: New drill press
Replies: 5
Views: 532

Re: New drill press

4-3/8" will work fine. I have a 4" quill travel Porter-Cable floor unit from Lowe's that I have been using with a milling-type jig, and it's fine except for the vibration, most likely from using the adjustable table. My Dad recently gave me an old Rockwell 15" with Rudell Jig, and it is much better,...
by DarkHorse
September 6th, 2015, 3:11 am
Forum: The Pro Shop
Topic: Thumb molds vs thumb slugs
Replies: 4
Views: 418

Re: Thumb molds vs thumb slugs

I've never used a mold personally, but they can be used with the IT system. Vise sells an IT ready for the mold, but you might get away with using a regular IT. Your PSO needs to size properly - a 1-1/4" mold would go into a 1-3/8" IT, etc. I've done this before, and the only "trick" is to not drill...
by DarkHorse
August 14th, 2015, 1:33 am
Forum: The Pro Shop
Topic: Info on Rockwell/Delta 15-249 drill press?
Replies: 12
Views: 1253

Re: Info on Rockwell/Delta 15-249 drill press?

I've heard not-so-good things about the Bill Taylor fitting tools, but have never used one so can't say for certain. If that's what you know I guess it'll work. I started with a Brunswick fitting ball, and we use the Jayhawk adjustable model at work. The Jayhawk looks fancy, but I don't think it's a...
by DarkHorse
August 13th, 2015, 1:30 am
Forum: The Pro Shop
Topic: Info on Rockwell/Delta 15-249 drill press?
Replies: 12
Views: 1253

Re: Info on Rockwell/Delta 15-249 drill press?

That appears to be some kind of layout tool. The "T" shaped end would be used to scribe the cut lines for the fingers, and you would use the ruler portion to mark the thumb location. The big drawback I see is a fixed span offset for the fingers - perhaps that indicates the age of the tool, as I've h...
by DarkHorse
August 12th, 2015, 9:31 pm
Forum: The Pro Shop
Topic: Advice on thumb pitch?
Replies: 20
Views: 1332

Re: Advice on thumb pitch?

2.5" would be considered a "long" thumb and you would typically add Reverse, but having dry skin should negate that, so you may not need those particular adjustments. The standard "formula" for thumb fit is: 40% of fit is span 40% of fit is pitches 20% of fit is thumbhole size/shape Some people thin...
by DarkHorse
August 12th, 2015, 8:36 pm
Forum: The Pro Shop
Topic: Info on Rockwell/Delta 15-249 drill press?
Replies: 12
Views: 1253

Re: Info on Rockwell/Delta 15-249 drill press?

Bummer on the missing handles, but you should be able to make your own. I'm curious about the small red knobs near the threaded rods - I have not seen those before, but they appear as though they tighten down on the plates to lock in the pitches, so you may not need another clamp. If that's the case...
by DarkHorse
August 12th, 2015, 2:56 am
Forum: The Pro Shop
Topic: Advice on thumb pitch?
Replies: 20
Views: 1332

Re: Advice on thumb pitch?

Something nobody has touched on yet - how long is your thumb, and do you have sweaty or dry skin?

Shorter thumbs and dry skin will clear the hole quicker than longer thumbs and sweaty/clammy skin.
by DarkHorse
August 12th, 2015, 2:36 am
Forum: The Pro Shop
Topic: Info on Rockwell/Delta 15-249 drill press?
Replies: 12
Views: 1253

Re: Info on Rockwell/Delta 15-249 drill press?

As the images from the linked post shows, the Rudell jig should have the scales engraved into the plates. The desired pitch is obtained by lining the edges of the plates with the scales. The downside is it's only measured to 1/8" so you may want to etch in 1/16" for consistency. Cranking the front h...
by DarkHorse
July 24th, 2015, 9:50 pm
Forum: The Pro Shop
Topic: ball cracking
Replies: 7
Views: 691

Re: ball cracking

I just wanted to add that I've had two Storm balls suffer this radial cracking around the thumb hole. I use a Turbo SG system. I own several other Storm balls (as well as other brands of BBs), with the Turbo SG system installed, and have no cracking. I decided to repair the cracking myself (both BB...
by DarkHorse
June 14th, 2015, 5:25 am
Forum: Layout Advice
Topic: How to tune Rack Attack Pearl's reaction
Replies: 11
Views: 1615

Re: How to tune Rack Attack Pearl's reaction

Understand something about the Blueprint Track Flare Study - it never said the actual Drilling Angle has no effect in symmetrics, it said that swinging the CG as a means to determine the Drilling Angle has no effect. Drilling Angle will absolutely have an effect on symmetric ball motion, but you est...
by DarkHorse
June 10th, 2015, 4:16 am
Forum: Layout Advice
Topic: Pin down layout help
Replies: 21
Views: 1296

Re: Pin down layout help

A PAP shifting 1" seems excessive. According to your first post, you used a PAP of 4-1/4" R' 0 U/D to layout this ball. My comment was to suggest that if you had taken those measurements off of a high-flaring ball your actual PAP could be further Right, compared to taking the PAP off a low-flaring b...
by DarkHorse
June 10th, 2015, 4:01 am
Forum: The Pro Shop
Topic: Turbo thumb switch grips
Replies: 18
Views: 2973

Re: Turbo thumb switch grips

Do the Turbo SG or Vise IT systems handle the larger pitches used by the Slowinski ADT grip? I'm using 1 1/4" left lateral and 3/4" reverse and wondering if either system has any issues with the extreme angles? Thanks! Steve Potentially, but it depends on thumb length and pitch. I use 7/8" Forward,...
by DarkHorse
June 3rd, 2015, 3:57 am
Forum: Layout Advice
Topic: Plugged symmetrical ball could now be asymmetrical
Replies: 8
Views: 986

Re: Plugged symmetrical ball could now be asymmetrical

I believe the article is a good one and the model/simulation/data accurate, but... critical-theory-plugged.jpg I have a ball similar to their case #5. It's currently been plugged and redilled 5x with multiple balance holes as well. I don't know what it was like prior to plug/drill #4, but the react...
by DarkHorse
May 31st, 2015, 4:51 am
Forum: Layout Advice
Topic: Plugged symmetrical ball could now be asymmetrical
Replies: 8
Views: 986

Re: Plugged symmetrical ball could now be asymmetrical

http://forum.bowlingchat.net/viewtopic.php?f=15&t=9194&hilit=plugged" onclick="window.open(this.href);return false; This question seems to pop up every once in awhile. A good question, but the general consensus is don't worry about it. A Determinator may show differently, but that and an RG swing wo...
by DarkHorse
May 29th, 2015, 11:48 pm
Forum: Layout Advice
Topic: Pin down layout help
Replies: 21
Views: 1296

Re: Pin down layout help

Bowling balls flare in air, as evidenced by the Double Thumb layout, so stronger layouts can move the perceived PAP inward and up. Also, consider the piece of tape you use to measure the PAP is much larger than the actual PAP - 1" or so compared to the tip of a pencil. Still, that does seem like a l...