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Seller Details
mjbillo Posts: 1 Registered: May 2008 Location: USA	Feedback: None See Detailed Feedback Contact Seller View seller's other items

Electronic Thread Dial Indicator

Quantity	Views	Date Posted
10	1623	Sun November 1, 2009

Asking Price	Shipping Amount	Condition
$180.00	None	Excellent

Description:

Electronic Thread Dial Indicator – Utilizing Hall Sensor Technology – Ten User Selectable Dividing Scales - Eight LED's – On/Off Switch – User Reset – Low Power CMOS Circuitry That Runs On A Single 9 Volt Battery. Retrofit Kit for Lathes That Don’t Have A Thread Dial Indicator. Includes Hall Sensors, Holders and Brackets, Eight Powerful Magnets with Epoxy, Through Bulkhead Connectors, Connector Cutout Template, Mounting Hardware and Control Module.

Keywords:

Electronic Thread Dial Indicator

Author

Ryobiguy

Registered: April 2004
Location: Martinez, CA
Posts: 40

Comment Date: Fri December 25, 2009

Does it work if the leadscrew has a keyslot in it (such as used to drive cross feed)?

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mjbillo

Registered: May 2008
Location: USA
Posts: 1

Comment Date: Sat December 26, 2009

Dear Ryobiguy,

I suspect it would work because it actually functions based on the absolute position of the rotating lathe head. Nine magnets are intended to be positioned on the drive pulley that is rigidly attached to the lathe head. Eight positions; at 45 degree intervals, are decoded by one of the Hall Effect sensors and one position has two magnets to decode 0 or 360 degrees (by the second Hall Effect sensor). Because the sensing of the lathe head is done off the absolute position of the lathe head it does not matter where the feed screws are at.

In operation, as the lathe head rotates the Thread Dial Indicator (TDI) lights one of the eight LED’s based on where the lathe head is positioned and progressively lights the next LED in the circle of eight as the lathe head rotates. A user selectable digital divider (seven different possible settings) slows or speeds up the amount of time between each of the LED’s being turned on, which facilitates being able to cut threads at just about any lathe head rotational speed.

A typical threading operation would be to position the x axis at a known location and engage the x axis once one of the TDI’s LED turns on. This would cut the first pass of threads on your stock. To stop cutting the thread would either be to disengage the x axis feed manually or via an auto disengage mechanism that you lathe may or may not have. If you have to manually disengage the x axis, then you must select a feed speed in which you can react manually without over or under shooting where you want to stop the feed at. Next you would back the thread cutting bit away (Y axis movement) from your stock, return the tool bit back to the starting x axis location, position where the thread cutting tool bit is at (Y axis movement) and then wait for the TDI to light the LED in which you used to cut the first pass of cutting the thread and engage it for each successive pass at cutting the thread. As long as the X axis is at the same starting point and you engage the x axis feed at the same time the LED was light up, you’ll cut the thread properly.

Hope this answers your question. If you purchase a TDI and it doesn’t work for your particular lathe, I will refund your purchase minus any shipping cost.

Thanks,

MJBillo

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