The 9x20 Mods Thread

[Bill Gruby]

Re: 9x20 tool post flex

Yes the ratio would/can be 1:1, but the handwheel is much bigger making the spaces between the graduations larger. That is increasing the resolution. So you can now add another level of graduations, like tenths. That again, is increasing the resolution. Let me think more on the small handwheel with too big a hand.

All I will be doing is adding a ring to the old Hand Wheel. The Graduated ring on the old wheel will be retained. Nothing changes there. I did the same thing when I made the Cross Slide hand Wheel larger.

"Billy G"

 

[Bill Gruby]

Re: 9x20 tool post flex

Two more Gears ordered. Delivery Thursday of next week. I will do the handle today.

"Billy G"

 

[Bill Gruby]

Re: 9x20 tool post flex

I found this Bushing. It is not what I will use, it is to help you understand how I will enlarge the handwheel.

"Billy G"

 

[chips&more]

Re: 9x20 tool post flex

Here it is. Thoughts please. All will be graciously accepted. One mistake, where it says Driver gear attached to Lead screw, it should say Driven Gear. The Drive Gear is at the hand wheel. Sorry for any confusion.

"Billy G"

What about a cogged belt with matching pulleys instead of the gearing? With the CB, you can easily control the backlash issue with an idler pulley. Looks easier to make too. You might even get lucky and harvest the parts needed out of an old printer…Good Luck, Dave.

 

[Bill Gruby]

Re: 9x20 tool post flex

Charles;

If it is OK with you, why don't we put all mods to the Asian 9X20's in this thread. no one will have to search the Forum to find them.

"Billy G"

 

[savarin]

Re: 9x20 tool post flex

Charles;

If it is OK with you, why don't we put all mods to the Asian 9X20's in this thread. no one will have to search the Forum to find them.

"Billy G"

excellent idea, maybe a new title such as 9x20 mods then sub titles under what ever area the mod is.

 

[Bill Gruby]

Three Bronze shoulders made from scrap turn $37.50 worth of Boston Gears into $96.50 worth of gears. It pays to save those small cut-offs.

"Billy G"

 

[Bill Gruby]

Mock up done. All centers are correct and the gears will clear the mounting bolts. (2 cap screws) It's time to make chips. :lmao:

"Billy G"

 

[chhedausa]

2 very simple mods to the tail stock.

1. Replacing the hold down bolt with a carriage bolt, and adding a spring and a couple of nuts will keep it sturdy and free from sticking if feeding by hand.

2. Adding a wrench/handle quick hold down / release.


Added new nut. Stock one stripped fast. The wrench stays on nicely and I can take it off if it gets in the way.



Bottom plate stays straight due to the bolt & nut holding it in place. The spring pushes it down.

Bolt head needs to be ground on two sides to fit snug.

Threads on bolt need to be ground so spring can move freely.

 

[Bill Gruby]

The front cover is done sans the holding crews. The centering bushings are brass and pressed in.

"Billy G"