Hello ALL an interesting and HOT topic cropped up is Chat GPT (information retrive / gathering) use in our daily life for any application like leathercraft, Knowledge, Experience from other expert, Any topic of interest BUT there are there any limitation, like how accurate, does it gather all "old data" to support (share one question which is bugging my mind)
Like any tools do bear in mind there are no one answer and are trustworthy, it still need a human brain to scan and decide how to best use it in your application. This is my opion only solely from my expereince and past know how inform.
One example I have choosen to ask this software is there a new tools that can machine be use to duplicate the human doing hand stiching on leather work?
This is a the answer from Chat GPT....interesting answer.
皆さん、こんにちは。Chat GPT（情報取得/収集）について、興味深くホットな話題が浮上しました。革細工などの日常生活におけるあらゆる用途で活用できます。他の専門家からの知識、経験、興味のあるトピックなど、様々な用途に活用できます。しかし、精度の限界や、裏付けとなる「古いデータ」をすべて収集できるかどうかなど、何か制限があるのでしょうか？（頭を悩ませている疑問を一つ共有します。）
他のツールと同様に、信頼できる唯一の答えは存在しないことを覚えておいてください。人間の脳がスキャンし、アプリケーションに最適な方法を判断する必要があります。これは私の経験と過去のノウハウに基づく意見です。
このソフトウェアについて質問したいことの一つは、革細工における人間の手縫いを機械で再現できる新しいツールはありますか？
これはChat GPTからの回答です…興味深い回答ですね。
You said:
You are an expert in leathercraft and sewing machines.
Can you find out if there is any sewing machine that duplicates the handstitching.
Ask any clarifying questions before you start deep research
ChatGPT said:
To help narrow this down, could you clarify a few details:
Are you referring specifically to the saddle stitch look (common in hand-stitched leathercraft)?
What kind of materials are you stitching—just leather, or also canvas, nylon, etc.?
Do you have any constraints (e.g. budget, machine size, power source, domestic vs. industrial)?
Are you open to specialty machines or modifications (e.g. needle feed or twin-needle machines)?
This will help me identify machines that best replicate true handstitching.
You said:
1 yes
2 canvas and leather
3 no budget
4 yes
ChatGPT said:
Thanks! I’ll look into sewing machines capable of duplicating the appearance and strength of traditional saddle stitching by hand, for use on leather and canvas. I’ll include both industrial and specialty machines, even ones that require modifications or accessories, since there’s no budget limit. I’ll let you know as soon as I’ve gathered the best options and insights.
Research completed in 7m · 23 sources · 90 searches
Sewing Machines for Saddle-Stitch–Style Leathercraft
Saddle stitch (hand) vs machine: Hand-stitched saddle stitch uses two needles and waxed threads passed through each hole, creating two independent interlocked seams. This makes saddle stitching extremely durable – if one thread breaks the other still holds the seam
corterleather.com
hooptalent.com
. By contrast, a standard sewing machine produces a lockstitch: one top thread interlocked with one bobbin thread. A lockstitch unravels if the bobbin thread breaks (and vice versa). Thus “true” saddle stitch – two threads alternately locking – cannot be done by a conventional machine
corterleather.com
. Instead, machines can simulate the saddle-stitch look and add strength by using two parallel lockstitch lines (twin-needle machines) or special stitches. True saddle-stitch machines: Very few industrial machines claim a “saddle stitch” function. For example, the Union Special 100 (aka “Prick/Saddle Stitch”) is a specialized cylinder-bed machine marketed for light-to-heavy materials including leather
industrialsewing.co.uk
. It uses a single-needle “prick stitch” that approximates the hand stitch, but it is still a lock rather than two independent threads. In practice, most leatherworkers accept that no off-the-shelf machine makes a genuine saddle stitch; instead, they use twin-needle lockstitch machines or decorative settings that yield a similar appearance and enhanced strength
corterleather.com
hooptalent.com
. Figure: TechSew 20618-2 heavy-duty industrial sewing machine (2-needle walking foot). Such machines sew two parallel lockstitch seams for a saddle-like look
techsew.com
hooptalent.com
.
Twin-Needle Walking-Foot (Double-Lock) Machines
Heavy leather goods manufacturers often use double-needle lockstitch machines. These have two side-by-side needles and two bobbins, producing parallel lockstitch lines. Each needle has its own top and bobbin thread, creating two independent stitches. By design, if one needle/thread fails, the other line still holds the seam – much like the hand saddle stitch’s redundancy
hooptalent.com
hooptalent.com
. Although still not a true saddle stitch, this “double-lockstitch” is very strong and gives an appearance similar to hand stitching. Key models include:
TechSew 20618-2 (USA): A 2-needle walking-foot flatbed machine for leather and canvas. Compound feed (walking foot) drives the material, and the needles are ¼″ apart (upgradeable to 3/8″ or 1/2″ spacing)
techsew.com
. It handles up to ~10 mm (⅜″) thick leather, with high presser-foot lift and large hook/bobbin for long stitches
techsew.com
. It sews leather, vinyl, canvas, upholstery, etc., and is used in upholstery, automotive and sports gear
techsew.com
. Pros: very heavy-duty, reversible stitching, servo motor, large bobbin, strong feed. Cons: bulky, expensive, single-angle (flatbed only).
ConSew (CS) P2339RB series (Taiwan/China): Many models (e.g. 327RB-2) offer split-needle double-head machines. For example, the ConSew 327RB-2 is a double-needle, split-bar, needle-feed, drop-feed lockstitch machine
jacksew.com
. It supports heavy fabrics (leather, canvas), with adjustable stitch length and high foot clearance. It can be run as a single needle by removing one needle if needed. Pros: robust frame, needle-feed for heavy layers, adjustable stitch length. Cons: also large and pricey, requires industrial setup.
Pfaff 1246 (Germany): A world-famous double-needle flatbed machine with unison feed (compound needle+puller feed)
pfaff-industrial.com
pfaff-industrial.com
. It has a large vertical rotary hook (extra bobbin capacity) and high feed lift (7 mm feed, 14 mm foot clearance
pfaff-industrial.com
) for sewing thick leather goods. Pfaff markets it for “upholstery, leather clothing, leather goods”
pfaff-industrial.com
. Pros: Unison feed ensures even fabric motion, very high stitch quality, industrial durability. Cons: Very expensive, heavy, flatbed (no cylinder).
Durkopp-Adler 867 (Germany): A premium double-needle walking-foot heavy-duty machine. It features triple feeding (walking foot + needle feed + bottom feed) and can sew up to 12 mm stitch length
foxsew.en.made-in-china.com
. (A vendor description notes it has “bottom feed, needle feed and alternating feet” and automatic presser lifter
foxsew.en.made-in-china.com
.) The 867 is geared for leather furniture, automotive upholstery, belts, bags, etc.
foxsew.en.made-in-china.com
. Pros: Extreme power and penetration, automatic functions (foot lift, trimming), huge bobbin. Cons: Very costly, complex, industrial-scale.
All these double-needle machines produce parallel lock stitches that mimic a saddle stitch’s look. As HoopTalent notes, “two independent lock stitches that reinforce each other” make double-needle seams ideal for heavy fabrics like leather
hooptalent.com
. In fact, even if one thread breaks, the other line keeps the seam intact
hooptalent.com
, greatly improving durability over a single lockstitch seam.
Single-Needle Heavy-Duty Machines
For many leathercrafters (especially hobbyists or small shops), a single-needle walking-foot or compound-feed machine suffices. These machines sew a standard lockstitch (one needle, one bobbin thread), but heavy-duty models can handle thick leather and canvas. They don’t replicate saddle stitching, but with thick thread (#69 or #92) and long stitches they produce a rugged seam. Popular examples:
Sailrite Leatherwork / Ultrafeed (USA): A compact single-needle walking-foot machine based on Sailrite’s Ultrafeed. Specially tuned to sew up to 16 oz (~5 mm) leather
sailrite.com
. It has knurled feet and feed dogs to grip leather without marking it, plus a powerful 3/4 hp servo motor
sailrite.com
. Sailrite’s Leatherwork machine can sew upholstery leather, belt/saddle leather and even canvas and denim
sailrite.com
sailrite.com
. It is table-mounted (flatbed) but also sold with an optional Cylindrical platform. Pros: Relatively affordable, portable, easy to use, good support. Cons: Maxes out ~5 mm leather; only single lockstitch; relatively slow.
Singer 111W/112W (vintage Japan/China): Iconic walking-foot lockstitch machines (often found used). With #138 heavy needles they sew up to about 6 mm leather
leatherworker.net
. These cast-iron machines (and their modern clones, e.g. Singer 20U) have high power and are still used for upholstery/leather. Pros: Robust, simple, proven feed; parts availability. Cons: No servo/electronic control (usually clutch motor), limited to one needle.
Juki DNU-1541 or Juki LU-1181 (Japan): Modern industrial single-needle walking-foot machines for leather. The DNU-1541 is long-arm (sleeve style) with powerful feed for multiple layers (used for footwear and belt loops). The LU-1181 is a flatbed walking-foot machine. Both can handle heavy materials and #138–#207 thread. Pros: High speed, programmable, global support. Cons: Very expensive, needs 220 V power.
Consew 206RB / 206RBL (USA): Single-needle heavy machines with compound feed. The 206RB is flatbed; the 206RBL is long arm. These have a presser-foot that drops and rises in sync (Compound feed), improving control over thick layers. They handle upholstery, leather and canvas (similar to Singer 111W design). Pros: Proven in marine/auto upholstery. Cons: Also older models, parts can be scarce; heavy.
Home/Overlock/Decorator Machines: High-end home machines (e.g. Janome MC15000, Brother Innov-is, etc.) have decorative “saddle-stitch” patterns or a twin-needle zigzag that mimics saddle. However, these are mostly for aesthetics and typically use thinner thread. They are not recommended for high-strength leather seams – they do a lockstitch or chainstitch.
Key features: In general, leather/canvas machines should have a walking foot or compound feed (needle+walking) to grip thick materials evenly. Large presser-foot clearance (1/2″–1″) and high feed lift are essential for heavy layers
pfaff-industrial.com
. A powerful motor (servo/DC for speed control) helps. Many leather machines use roller feet or knurled feet to prevent marking. For seams along curved or tubular parts, a cylinder-arm machine (see below) is ideal. Figure: Sailrite Leatherwork heavy-duty walking-foot sewing machine (single-needle, flatbed) for leather/canvas. It sews up to 16 oz leather or canvas
sailrite.com
sailrite.com
.
Cylinder/Post-Bed Machines
Leather items with tight curves or gussets (like gun holsters, boots, purses, belts, bag edges, collars) benefit from a cylinder-arm machine. These have a narrow, protruding arm so you can wrap the leather around it. Examples:
Durkopp-Adler 669 (Germany): A slim 13″ cylinder-bed walking-foot machine
weaverleathersupply.com
. It has powerful feed and a large hook/bobbin, and can run at ~2,600 SPM. Weaver notes it is “ideal for manufacturing belts, bags, chaps, garments and other small leather goods”
weaverleathersupply.com
. Its cylinder allows sewing tubular or curved pieces. Pros: High-speed servo drive, good for belts/bags, excellent build. Cons: High cost ($6k+), complex to set up.
Adler 205-370 / Weaver 205 (Germany/USA): A classic compound-feed long-arm flatbed machine, rated to sew up to 3/4″ thick leather
weaverleathersupply.com
. It has three-way feed (needle, walking, bottom puller) and huge foot lift (1″). It can sew awkward shapes on a wide table. Used for saddlery, upholstery, footwear. Pros: Ultimate power for belts, can run #207 thread, 1″ lift
weaverleathersupply.com
. Cons: Very expensive, large.
Portable/Tippmann Boss: The Tippmann Boss is a handheld, portable lockstitcher. It can sew up to ~1″ thick leather by hand-feeding material
tippmannindustrial.com
. It’s essentially a mechanical machine with no power cord. Pros: Extremely portable (no table needed). Cons: No saddle-stitch simulation; operation is slower and more manual than bench machines.
Cylinder machines use many of the same feed mechanisms as flatbeds (walking foot, puller, etc.). Their advantage is simply geometry: you can pivot leather around the cylinder. However, their stitch pattern is still lockstitch.
Saddle/Prick-Stitch Machines
The only machines explicitly called “saddle stitch” machines (apart from twin-head systems) are specialty industrial machines (often for saddlery or bookbinding). For example, the Union Special 100 (“Prick/Saddle Stitch”) is a single-needle machine that uses an angled needle bar to make a pricking stitch. Weaver’s UK distributor notes it’s for light–heavy work (cotton, leather, synthetics) and can do a “prick stitch” that resembles hand saddling
industrialsewing.co.uk
. In practice, however, it’s still a one-thread lockstitch (just with a zigzag needle path)
industrialsewing.co.uk
. Such machines are rare and very specialized, so most leather goods makers rely on the twin-needle approach instead. Decorative alternatives: Some crafting machines offer decorative “saddle stitch” patterns (zigzag designs) and use twin needles with two thread spools for a faux-saddle look (often in two colors). While aesthetically interesting, these are typically weaker than a proper double-lock seam and meant for craft rather than load-bearing use.
Comparison of Representative Machines
Machine (make/model) Needles Feed Type Bed Type Max Thickness Materials Notes (pros/cons)
TechSew 20618-2 (USA) – 2-needle flatbed
techsew.com
2 (¼″ spacing) Compound walking foot Flatbed ≈10 mm (⅜″) leather
techsew.com
Leather, canvas, vinyl, upholstery
techsew.com
Heavy duty; large hook/bobbin; servo motor; durable
techsew.com
. Relatively affordable (by industrial standards).
Consew 327RB-2 (China) – 2-needle flatbed
jacksew.com
2 (split-bar) Needle feed + walking drop-feed Flatbed Heavy layers (e.g. belt leather) Leather, canvas, vinyl
jacksew.com
Split needle bar allows angled stitches; heavy frame; accessories (servo, table) often included.
Pfaff 1246 (Germany) – 2-needle flatbed
pfaff-industrial.com
2 Unison feed (needle + puller) Flatbed Thick leather (high foot lift 14 mm)
pfaff-industrial.com
Upholstery, leather goods
pfaff-industrial.com
Premium build; large vertical hook; even feed; more expensive; flatbed only.
Durkopp-Adler 867 (Germany) – 1 or 2-needle flatbed
foxsew.en.made-in-china.com
2 (series) Walking + needle + bottom (triple feed) Flatbed Very heavy (12 mm stitch length)
foxsew.en.made-in-china.com
Leather furniture, bags, belts
foxsew.en.made-in-china.com
Ultimate heavy-duty; automatic functions; very high price; industrial.
Sailrite Leatherwork (USA) – 1-needle flatbed
sailrite.com
1 Walking foot Flatbed ~5 mm (16oz) leather
sailrite.com
Upholstery leather, canvas
sailrite.com
Compact hobbyist machine; servo motor; knurled feet; good support; moderate price.
Adler/Weaver 205 (Germany/USA) – 1-needle flatbed
weaverleathersupply.com
1 Compound feed (needle + walking + puller) Long-arm flatbed ~19 mm (¾″) leather
weaverleathersupply.com
Belt leather, upholstery, footwear Legendary power (1″ foot lift); best for very thick leather; very expensive, heavy.
Adler 669 (Germany) – 1-needle cylinder
weaverleathersupply.com
1 Walking + puller Cylinder (13″ arm) Medium (up to #138 thread)
weaverleathersupply.com
Belts, bags, tubular leather
weaverleathersupply.com
Slim cylinder; good for belts, straps; high speed servo; niche (uses ~110V).
Table: Comparison of selected leather/canvas sewing machines. “Flatbed” = standard table machine; “cylinder” = narrow arm for tubular parts. Thickness is approximate. Sources: manufacturer and retailer data
techsew.com
pfaff-industrial.com
jacksew.com
foxsew.en.made-in-china.com
weaverleathersupply.com
weaverleathersupply.com
.
Recommendations by Use Case
Leather Bags (totes, backpacks, saddlebags): Typically use medium-thickness leather (2–4 mm). A heavy-duty single-needle machine (e.g. Sailrite Leatherwork, Singer 111W, Consew 206RB) is often sufficient. For long seams or decorative double lines, a twin-needle walking-foot machine (like TechSew 20618-2 or Pfaff 1246) works well. Cylinder machines (Adler 669) are handy for corners or bag gussets. Key features: walking foot feed and large arm clearance to manage bag seams.
Small Goods (wallets, phone cases, wallets inner parts): These often use thinner leather. A high-end hobbyist machine (like Sailrite Ultrafeed/Leatherwork or even a heavy-duty domestic machine) can do the job. Since wallets are small, a cylinder or post-bed (like Adler 311/151 long-arm) can be very convenient for tight areas. Stitch length is often short; heavy stitch (longer) can look too coarse on small pieces.
Belts and Straps: Belts use very thick leather (often 4–6 mm up to 12+ mm after creasing/layering). Only the largest machines handle this. Industrial belt makers use machines like the Adler 205/Weaver 205 or Durkopp 867, which have 1″ foot lift and can penetrate ¾″ leather
weaverleathersupply.com
. A cylinder-bed (Adler 669) is often used for sewing the buckle-end tube. For serious belt work, the investment in an industrial leather machine is justified. (A portable Tippmann can also sew belt pieces, but alignment is very manual.)
Canvas Gear (tents, awnings, sails, outdoor fabrics): Heavy canvas is easier to feed than stiff leather, but still thick. Any heavy-duty walking-foot machine will do. For example, Sailrite is famous for canvas work (boat sails, tarps). In fact, Sailrite’s Ultrafeed was originally an “Ultrafeed LS (Laminate/Skip)” machine for canvas. Canvas sewing often uses multiple layers, so needle-feed or compound-feed machines help. The TechSew 20618-2 explicitly lists canvas, awnings, luggage, boat covers, etc.
techsew.com
. ConSew and Juki double-needle machines also handle canvas seam finishing well. Key is a strong feed (walking foot) and avoiding feed slips.
Pros and Cons – Summary: Double-needle machines (Pfaff 1246, TechSew, Consew, Durkopp) give the best “hand-stitched” look and extra seam security
hooptalent.com
hooptalent.com
, but are large and costly. Single-needle machines (Sailrite, Singer, Juki) are simpler and more affordable, but only make a standard lockstitch. Cylinder and long-arm machines add convenience for tough angles at the cost of additional expense. In all cases, no machine can exactly equal a true hand saddle stitch, but choosing a heavy-duty machine with double-needle operation or long stitches will come closest in appearance and yield seams that are highly durable. Sources: Manufacturer and retailer specifications and guides
techsew.com
pfaff-industrial.com
industrialsewing.co.uk
jacksew.com
hooptalent.com
weaverleathersupply.com
, plus expert overviews of leather vs machine stitching. Images of machines are by manufacturer.
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* Note: This is trail use of "Google Translate" application from ENGLISH to JAPANESE, sorry if this translation do not make sense or suitable word or sentence, please do let me know and thank you.
* 注: これは英語から日本語への「Google 翻訳」アプリケーションの試用です。この翻訳が意味をなさない、または適切な単語や文でない場合は、申し訳ありませんが、お知らせください。ありがとうございます。
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