T37 Quick Change Toolpost & Accessories | Lathe Tool Holders & Spare Parts | Bluefox Tools

T37 Quick Change Toolpost Accessories, Lathe Tool Holders
& Replacement Parts

Equipping a small-to-medium precision lathe with an
efficient, reliable tool holding system transforms every setup, pass, and tool
change. For machinists, model engineers, and production operators utilizing
Myford lathes, specifically the iconic Myford ML7, Super 7, and ML10
series, the T37 Quick Change Toolpost system (often referred to in the
UK and worldwide as the Dickson-style T37 system) remains the gold standard for
compact, ultra-rigid tool control.

When working with manual engine lathes, traditional four-way
toolposts or single-point lantern posts require constant shimming, height
measuring, and readjustment whenever you swap from a roughing tool to a
finishing bit, threader, or parting blade. The BlueFox T37 Quick Change
Toolpost system completely eliminates manual shimming through an
integrated, micro-adjustable height mechanism on each tool holder. Combined
with precision-ground V-ways and a robust internal cam-locking mechanism, the
T37 system provides near-instantaneous tool changes while maintaining center
height and alignment.

Whether you are performing precision turning, heavy facing,
deep parting, or stepped shoulder machining, this collection supplies complete
5-piece T37 toolpost sets, standalone main blocks, standard turning holders,
extended-reach tool holders, and dedicated parting tool holders engineered
specifically for Myford lathes and compatible small-bench metalworking
machinery.

Technical Overview: The Mechanics of the T37 Toolpost
System

The T37 series is specifically sized and proportioned for
lathes with swing capacities around 7 inches (approx. 175 mm) to 9 inches over
the bed, making it an exact dimensional match for the Myford compound slide
T-slot and center stud dimensions.

Key Mechanical Design Principles

1. Dual
   V-Way Alignment Rails:

Unlike simple dovetail systems that rely on flat slide
clamping, the T37 system incorporates dual precision-ground V-ways on the main
block that mate directly with matching V-grooves on the rear of each tool
holder. This dual-V geometry forces the tool holder into exact axial alignment
every time the locking handle is engaged.

1. Eccentric
   Cam Locking Action:

Operating the main block's central locking handle rotates an
internal hardened eccentric cam pin. This pin drives internal locking lugs into
the recessed slots of the tool holder, pulling the holder tight against the
ground reference faces of the main block. The resulting clamping force prevents
tool rotation or lifting, even during heavy interrupted cuts.

1. Micro-Adjustable
   Height Screw:

Every T37 tool holder features a threaded elevation screw
and knurled lock ring at the top. Once you establish the true center height of
a cutting tip relative to the lathe spindle center line using a dial indicator
or tailstock center point, you lock the height screw nut. From that moment
forward, removing and reinserting that holder guarantees immediate return to
true center height without measuring or shimming.

1. Hardened
   and Precision-Ground Steel Construction:

All load-bearing surfaces, including the V-ways, main block
core, tool slots, and lock screws, undergo heat treatment to resist chip
indentation, surface wear, and galling. This ensures high dimensional stability
across thousands of clamping cycles in active machine shop environments.

Detailed Breakdown of T37 Collection Products

Every machining task requires specific tooling geometry. The
BlueFox Tool Mart T37 collection includes individual replacement components and
complete setup packages designed to support full lathe operations.

1. Complete T37 Quick Change Tool Post Sets

The complete quick-change setup is the definitive starter
and upgrading solution for Myford owners. Designed as a drop-in conversion kit
for Myford ML7, Super 7, and ML10 compound slides, choosing a BlueFox T37 Quick Change Tool Post Set Myford ML7 5 Piece
equips your lathe for immediate multi-tool operation.

• What's
  Included in the Set:
• 1x
  T37 Main Toolpost Block: Featuring ground V-ways, main clamping nut
  thread interface, and heavy-duty operating lever.
• 3x
  Standard Turning & Facing Holders (12mm / 1/2" capacity):
  For mounting square shank turning tools, indexable carbide holders, or
  braze-tip tools.
• 1x
  Dedicated Parting Tool Holder: Designed to accept standard high-speed
  steel (HSS) or carbide-tipped parting blades.
• 1x
  Mounting Key / Allen Wrench Set: For securing cutting tool clamping
  screws.

If you are outfitting a Super 7 or ML7 setup from scratch,
getting a complete T37 Quick Change Tool Post 5pc Set Myford Super7 ML7
provides all essential components in a single package.

2. Standalone T37 Main Block

The standalone T37 Quick Change Tool Post Main Block Myford ML7 Super 7 is
available for machinists who need a replacement block, wish to build custom
mounting arrangements for other lathe models (such as Boxford, South Bend, or
import mini-lathes), or want a second block dedicated to a rear toolpost slide.

• Ground
  reference faces ensure flat mounting on the compound topslide.
• Precision
  internal locking mechanism provides equalized pressure on holder V-ways.
• Directly
  accepts all standard Dickson-style T37 series tool holders.

3. T37 Standard Tool Holders (12mm & 13mm Capacity)

Standard turning holders are the primary workhorses of the
T37 system. They feature open-sided rectangular slots fitted with multiple
high-tensile set screws that firmly clamp tool shanks against the hardened
floor of the holder.

• 12mm
  Capacity Holders: Engineered to fit standard 12mm (approx. 1/2-inch)
  square shank turning, facing, threading, and boring bar tools. You can
  select either the T37 Standard Holder 12mm Quick Change Toolpost Myford
  or the standalone T37 Quick Change Tool Holder Myford Super7 ML7 to
  expand your bank of pre-set turning tools.
• 13mm
  Capacity Holders: Featuring an enlarged tool slot opening up to 13mm
  capacity, opting for the Dickson T37 Standard Holders 13mm allows the use of
  heavier 1/2-inch and 13mm tooling without requiring shank grinding or
  milling down.

4. Extended Reach Tool Holders

When machining components close to a large 3-jaw or 4-jaw
chuck, or when working near a bulky live center in the tailstock, standard tool
holders can run into clearance issues.

• Mounting
  a T37 Extended Quick Change Tool Holder 12mm gives you a
  longer tool pocket projection that steps the cutting tool forward away
  from the main block body.
• Provides
  vital tool post clearance during deep facing passes, undercut operations,
  or when working in tight contours where carriage travel is constrained.

5. Dedicated Parting Tool Holders

Parting off (cutting off) finished workpieces is one of the
highest-stress operations performed on a lathe. Flex or chatter during parting
leads to broken blades, ruined workpieces, or stalled spindles.

• Installing
  a T37 Parting Holder Dickson Quick Change Tool Post
  delivers a deep, vertically supported slot specifically contoured to clamp
  flat-section parting blades securely along their upper edge.
• Holds
  the blade perpendicular to the axis of lathe rotation, preventing blade
  twist and side binding during deep radial cuts.

Machine Compatibility: Myford Lathes & Beyond

While specifically tailored for British Myford lathes, the
physical dimensions and mounting specifications of the T37 quick-change system
make it highly versatile across a range of small-to-medium metalworking lathes.

Primary Supported Lathes

• Myford
  ML7 & ML7-R: Direct fitment on top of the original compound slide
  mounting location using standard T-bolts/studs.
• Myford
  Super 7: Fully compatible with center height proportions, allowing
  full range of cross-slide travel without binding.
• Myford
  ML10: Ideal match for swing over bed and topslide height constraints.

Secondary Supported Machinery (With Minor Mounting Stud
Adaptation)

• Boxford
  4.5" Lathes (A, B, C series)
• Raglan
  Little John
• Harrison
  11" (Secondary / Rear Toolpost Application)
• 7x12,
  8x14, and 9x20 Import Bench Lathes: Can be fitted by turned mounting
  studs or stepping down the center clamping bolt to match the T37 main
  block bore.

Machining Advantages of Upgrading to T37 Quick Change
Tooling

Upgrading from a traditional block or four-way toolpost to a
precision T37 quick change system directly impacts shop productivity, tool
longevity, and part accuracy.

1. Massive Downtime Reduction

In custom turning operations, changing tools often takes
longer than the actual cutting pass. With a pre-set bank of T37 tool holders
(e.g., rougher, finisher, threader, groover, and bore bar), switching tools
requires only a quarter-turn of the locking handle, lifting out the current
holder, dropping in the next, and locking the lever back down. Total swap time
drops from several minutes to under five seconds.

2. Micrometer-Level Center Height Control

Setting cutting tools precisely on center is vital:

• Above
  Center: Causes tool rubbing, lack of cutting clearance, high chatter,
  and tool push-off.
• Below
  Center: Leads to workpiece climbing, burrs at the stem center during
  facing, and premature edge chipping on carbide inserts.

The T37 elevation screw allows micro-adjustments as fine as
0.02 mm (0.001 inch), giving operators instant ability to dial in cutting edges
perfectly parallel with the lathe centerline.

3. Maximum Tooling Rigidity & Reduced Chatter

Chatter marks on finished turned surfaces are frequently
caused by flex in weak tool posts or excessive shim stacks under the tool
shank. The broad surface contact area of the T37 ground V-ways clamps the
holder solidly against the main block, creating a rigid metal-to-metal bond
that absorbs cutting forces and dampens vibration.

Step-by-Step Installation & Calibration Guide

To get the highest precision and repeatability out of your
T37 Quick Change Toolpost system, follow these standard installation steps when
mounting the block onto your Myford topslide:

Detailed Setup Procedures

Step 1: Surface Preparation

Thoroughly clean the top surface of the Myford compound
slide. Remove any burrs, nicks, rust, or dried oil using a fine Arkansas
oilstone and solvent. Ensure the underside base of the T37 main block is
equally clean; even small metal chips trapped beneath the block will throw off
tool squareness.

Step 2: Main Block Positioning & Alignment

Place the central clamping stud through the compound slide
T-slot nut and set the T37 main block over the stud. Orient the block so that
one pair of V-ways faces parallel to the lathe chuck/spindle axis and the
adjacent pair faces perpendicular (toward the cross-slide direction). Lightly
snug the main top clamp nut.

Step 3: Squaring the Block

Using a dial indicator mounted on the lathe chuck face or a
precision machinist square held against the faceplate, sweep across the front
face of the T37 block. Tap gently with a brass mallet until the block face is
perfectly square to the spindle centerline, then firmly tighten the top
clamping nut to lock the block to the compound slide.

Step 4: Setting Tool Center Height

1. Insert
   a 60-degree tailstock dead center into the tailstock quill.
2. Mount
   a turning tool into a T37 standard holder and drop the holder onto the
   main block V-ways.
3. Move
   the cam lever to lock the holder firmly into position.
4. Rotate
   the knurled elevation adjustment nut at the top of the holder until the
   cutting tip aligns precisely with the point of the tailstock center.
5. Lock
   the elevation nut into position using the knurled lock ring.

Tooling Selection Guide: Matching Tooling to Machining
Tasks

Choosing the correct T37 holder for each machining operation
optimizes cutting performance, extends insert life, and improves surface
finishes.

1. Outer Diameter (OD) Turning & Facing

For general straight turning, shoulder facing, and taper
turning:

• Use T37
  Standard 12mm or 13mm holders.
• Square
  shank tooling (10mm, 12mm, or 1/2-inch sizes) fits directly into the
  rectangular slot.
• Ensure
  all top set screws are evenly torqued down onto the tool shank to
  distribute clamping load.

2. High-Clearance Facing and Shoulder Work

When shoulder cuts or facing operations bring the carriage
extremely close to chuck jaws or revolving centers:

• Switch
  to the T37 Extended Tool Holder.
• The
  extended geometry moves the cutting tip clear of the main block body,
  allowing the carriage to travel further toward the headstock without
  interference.

3. Parting and Cut-off Operations

Parting requires maximum stiffness because cutting forces
act downward and outward simultaneously:

• Mount
  your parting blade into the T37 Parting Holder.
• Keep
  blade overhang from the holder as short as possible, only extend the blade
  slightly further than the radius of the stock being cut off.
• Lock
  the T37 cam handle securely and set lathe RPM to roughly one-third of
  standard turning speed with continuous cutting fluid application.

Maintenance & Best Practices for Long Service Life

To preserve the accuracy, smooth clamping action, and
sub-hundredth-millimeter repeatability of your T37 quick change system,
implement these maintenance routines in your workshop:

                            
Keep V-Ways Free of Swarf:

Fine cast iron dust and small steel chips can settle into
the matching V-grooves of the holder and main block. Always wipe or brush down
the V-ways with a clean lint-free cloth or brush before sliding a new holder
into place.

1. Lubricate
   Cam Pins and Threads:

Apply a few drops of ISO VG 68 way oil or light spindle oil
to the internal rotating cam shaft inside the main block once a week.
Periodically oil the elevation screws and set screw threads on each tool holder
to prevent galling.

1. Avoid
   Over-Torquing Clamping Screws:

The set screws securing cutting tools inside the holder
slots are made of high-tensile hardened alloy steel. Torque them firmly using
the correct hex wrench, but avoid using cheater pipes or excessive leverage,
which can bow the tool holder floor over time.

1. Store
   Unused Holders Clean and Oiled:

When non-mounted tool holders are kept in a drawer or rack,
apply a thin coat of rust preventative oil to protect precision ground
reference surfaces from humidity and oxidation.

Frequently Asked Questions (FAQ)

Q1: Will this T37 Quick Change Toolpost directly fit my
Myford ML7 or Super 7 without modifications?

Yes. The BlueFox T37 Quick Change Toolpost system is
dimensionally engineered to match the center height, topslide thickness, and
mounting slot dimensions of Myford ML7, ML7-R, and Super 7 lathes. The main
block mounts directly onto the standard compound slide stud.

Q2: What maximum tool shank size can I use in the T37
standard holders?

The T37 Standard 12mm holder accepts tool shanks up
to 12mm (approx. 1/2 inch) square. For slightly larger tooling, the Dickson
T37 13mm Standard Holder provides extra slot clearance up to 13mm shank
heights.

Q3: What is the difference between a standard dovetail
toolpost and a Dickson-style T37 toolpost?

Standard dovetail toolposts rely on a single flat angle
wedge or piston to press against a flat dovetail tongue. The Dickson-style T37
system uses dual external V-ways on the main block that seat into
matching double V-grooves inside the tool holder. This dual-V geometry provides
higher axial centering accuracy and resistance against twisting forces during
heavy cuts.

Q4: Can I mount round boring bars into the T37 standard
holders?

Yes. Round boring bars (e.g., 10mm or 12mm diameter)
can be clamped into standard rectangular holders using a split bushing or V-pad
placed beneath the set screws, or by using square-shank indexable boring bar
units.

Q5: Is the T37 system compatible with original vintage
Dickson tool holders?

Yes. The BlueFox T37 system follows standard T37 /
Dickson-size engineering geometry. BlueFox T37 holders are interchangeable with
original British Dickson T37 blocks and vice-versa, assuming standard
manufacturing tolerances.

Q6: Why should I choose an Extended T37 Holder over a
Standard Holder?

The extended holder moves the cutting tool shank
further forward away from the main block body. This provides additional
mechanical clearance when working close to large chuck jaws, faceplates, or
tailstock centers where the main block body might otherwise collide.

Upgrade Your Lathe Precision with BlueFox Tool Mart

Whether you are restoring a classic Myford lathe, building
out a precision model engineering workshop, or streamlining production turning
tasks, the BlueFox T37 Quick Change Toolpost collection delivers the
rigidity, speed, and exact center height control needed for flawless
metalworking results.

Explore the complete lineup of 5-piece T37 sets,
standalone main blocks, 12mm and 13mm standard holders, extended clearance
holders, and dedicated parting tool holders above to build a customized,
high-precision tooling setup for your machine shop today.